Sealing Unit Resistance Patterns for Display Defect Detection
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Solution Overview
Problem
Display apparatuses face challenges in detecting defects in sealing units before moisture or oxygen permeation, which can degrade their performance and lead to manufacturing inefficiencies due to the difficulty in identifying issues before they cause oxidation of organic light-emitting diodes.
Innovation Solution
Incorporating resistance measuring patterns on both surfaces of the sealing unit, connected to a terminal portion, allowing for the comparison of initial and actual resistance values to detect defects such as birdcaging or cracks, thereby identifying issues before they affect the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing unit is used to surround the display area, then moisture and oxygen permeation is prevented, but defects such as birdcaging or cracks are difficult to detect before they cause oxidation of organic light-emitting diodes
Solution Approach 1:
The patent applies preliminary action by incorporating resistance measuring patterns during the sealing unit formation process, enabling defect detection before the sealing unit is fully operational. The patterns are embedded in the sealing material itself, allowing early identification of defects like birdcaging or cracks through resistance measurements taken before moisture or oxygen permeation occurs.
Solution Approach 2:
The patent uses resistance measuring patterns as an intermediary element within the sealing unit. These patterns serve as a mediator that translates physical defects (cracks, birdcaging) into measurable electrical resistance changes, enabling indirect detection of sealing integrity issues without requiring direct visual inspection or destruction of the sealed structure.
2Difficulty of detecting and measuring
If resistance measuring patterns are incorporated in the sealing unit, then defect detection capability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by making the sealing material serve multiple functions: it provides the primary sealing function to prevent moisture and oxygen permeation, while simultaneously incorporating resistance measuring patterns that enable defect detection. This multi-functionality reduces the need for separate detection systems and minimizes overall device complexity.
Solution Approach 2:
The patent merges the sealing function and the measurement function into a single integrated structure. The resistance measuring patterns are formed within the sealing material itself during the same manufacturing process, combining what would traditionally be separate components (sealing unit and detection system) into one unified element.
3Productivity
If resistance measuring patterns are used to detect defects early, then manufacturing yield loss is reduced, but manufacturing process complexity increases
Solution Approach 1:
The patent performs defect detection in advance during the sealing unit formation process itself, before final assembly and packaging. By embedding resistance measuring patterns and conducting measurements at this early stage, the system identifies defective units before they proceed through subsequent manufacturing steps, preventing waste of time and resources on defective products.
Solution Approach 2:
The sealing unit performs self-diagnosis through the integrated resistance measuring patterns. The system uses its own internal structures (the resistance patterns embedded in the sealing material) to detect its own defects, eliminating the need for external inspection equipment or complex testing procedures during manufacturing.
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
This method enables early detection of sealing unit defects, reducing manufacturing yield loss and preventing moisture permeation, thus maintaining the display apparatus's performance and integrity.
Implementation Method 1
a first resistance measuring pattern located at an upper surface of the sealing unit, and a second resistance measuring pattern located at a lower surface of the sealing unit
Data Source
AI summary
A display apparatus includes: a first substrate including a display area and a peripheral area; a second substrate overlapping the first substrate; a sealing unit surrounding the display area and disposed between the first substrate and the second substrate; and a first resistance measuring pattern located at an upper surface of the sealing unit, and a second resistance measuring pattern located at a lower surface of the sealing unit, wherein each of the first and second resistance measuring patterns extends along edges of the first substrate and has a rectangular shape including an open side.