OLED Peripheral Barrier Structure for Tip Damage Detection
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Solution Overview
Problem
Conventional OLED devices face defects due to damage of the tip portion in the peripheral region, which can lead to moisture and water penetration, causing pixel defects, and this damage is difficult to visually observe during the manufacturing process.
Innovation Solution
The OLED device incorporates a conductive pattern that overlaps the protruded portion of the second barrier layer, allowing for the detection of tip damage by measuring resistance values between pad electrodes, thereby reducing defect ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional OLED device structure is used without additional detection mechanisms, then the device structure remains simple, but tip damage is difficult to detect visually during manufacturing, leading to undetected moisture penetration and pixel defects
Solution Approach 1:
The patent introduces a conductive pattern as an intermediary element that overlaps the protruded portion of the second barrier layer. This conductive pattern serves as a mediator between the tip portion and the measurement system, enabling indirect detection of tip damage through resistance measurements between pad electrodes, thereby solving the detection difficulty without requiring direct visual inspection of the damaged area
Solution Approach 2:
The patent replaces the mechanical/visual inspection method with an electrical measurement method. Instead of visually observing tip damage during manufacturing, the system uses resistance measurements through the conductive pattern to detect tip damage, substituting a non-contact electrical detection method for the conventional visual inspection approach
2Reliability
If the tip portion is damaged and not detected, then the device can be manufactured quickly without additional detection steps, but moisture and water penetrate causing pixel defects that reduce device reliability
Solution Approach 1:
The patent implements preliminary detection of tip damage during the manufacturing process through resistance measurements. By detecting and identifying damaged tips before final device assembly and packaging, the system can prevent defective devices from proceeding to later stages, thereby preventing moisture penetration and pixel defects that would otherwise occur after manufacturing
Solution Approach 2:
The patent establishes a feedback mechanism where resistance measurements provide information about tip damage status. The measured resistance values between pad electrodes feedback the condition of the tip portion, allowing real-time quality assessment during manufacturing and enabling corrective actions before defective devices are completed
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 effectively checks for and reduces the occurrence of pixel defects by detecting tip damage through resistance measurements, enhancing the reliability of the OLED device.
Implementation Method 1
allowing for the detection of tip damage by measuring resistance values between pad electrodes
Data Source
AI summary
An organic light emitting display device includes a substrate, a light emitting structure, a first conductive pattern, and a functional module. The substrate has an opening region, a peripheral region surrounding the opening region, and a display region surrounding the peripheral region, and includes a first groove, which has an enlarged lower portion, formed in the peripheral region and an opening formed in the opening region. The light emitting structure is in the display region on the substrate. The first conductive pattern overlaps the first groove in the peripheral region on the substrate. The functional module is in the opening of the substrate.