OLED Conductive Connector for Short-Circuit Prevention
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Solution Overview
Problem
Organic light emitting devices (OLEDs) are prone to short-circuit defects due to factors like pinholes, cracks, and coating roughness, leading to decreased light output or complete failure, especially in multi-pixel displays, and existing methods to increase the electrode gap to prevent short-circuits either fail to completely resolve the issue or increase manufacturing costs.
Innovation Solution
Incorporating a conductive connector with a high resistance value and a short-circuit preventing area, along with an auxiliary electrode, to isolate and redirect current flow, maintaining the OLED's functionality even with short-circuit defects while minimizing leakage current and maintaining the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the interval between anode and cathode is increased to prevent short-circuit defects, then reliability improves, but device thickness increases and manufacturing cost increases
Solution Approach 1:
A conductive connector with controlled high resistance is introduced as an intermediary element between the anode and cathode. This connector is strategically positioned to interrupt direct current paths through defect zones while maintaining electrical connection in normal areas. The high resistance property of the connector prevents excessive current flow through short-circuit defects, thereby improving reliability without requiring increased device thickness
Solution Approach 2:
The conductive connector is selectively placed only in specific defect-prone regions rather than uniformly throughout the device. This localized approach allows the connector to prevent short-circuit defects only where needed, avoiding unnecessary thickness increase and manufacturing cost across the entire device structure
2Reliability
If the interval between anode and cathode is increased to prevent short-circuit defects, then reliability improves, but manufacturing cost increases
Solution Approach 1:
The conductive connector serves as a cost-effective intermediary solution that can be integrated into existing manufacturing processes. Rather than requiring complete redesign or increased material usage, the connector is a targeted addition that leverages standard fabrication techniques, thereby improving reliability without proportionally increasing manufacturing cost
Solution Approach 2:
The electrode structure is segmented into functional regions: normal conduction areas and defect-prevention areas with conductive connectors. This segmentation allows manufacturing to focus resources on critical defect-prone zones rather than uniformly increasing specifications across the entire device, optimizing the balance between reliability and manufacturing cost
3Reliability
If organic layer thickness is increased to prevent short-circuit defects, then reliability improves, but manufacturing cost increases
Solution Approach 1:
The conductive connector acts as an intermediary protective element that prevents short-circuit defects without requiring increased organic layer thickness. This approach uses a targeted structural modification rather than bulk material increase, reducing the quantity of organic material needed while maintaining reliability
Solution Approach 2:
Instead of uniformly increasing organic layer thickness across the entire device, the conductive connector provides localized protection only in defect-prone regions. This segmented approach significantly reduces the quantity of organic material required compared to a uniform thickness increase
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 prevents short-circuit defects from causing complete OLED failure, maintains normal operation, and reduces leakage current, ensuring stable operation without increasing the electrode gap unnecessarily, thus addressing the cost and efficiency issues of existing methods.
Implementation Method 1
Incorporating a conductive connector with a high resistance value and a short-circuit preventing area, along with an auxiliary electrode, to isolate and redirect current flow
Data Source
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AI summary
The present specification provides an organic light emitting device (OLED) and a method for manufacturing the OLED.