High-Resistance Transparent Electrode for OLED Short Circuit Prevention
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Solution Overview
Problem
Organic light emitting devices in lighting apparatuses are prone to short circuits due to contact between the anode and cathode, leading to reduced light emission and operational failures, as existing methods cannot effectively prevent such defects.
Innovation Solution
Forming the first electrode with a high-resistance transparent conductive material (2800Ω to 5500Ω) to prevent overcurrent and ensure uniform current distribution, thereby preventing short circuits and maintaining light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the distance between anode and cathode is reduced to improve device compactness, then the device size is reduced, but pinholes and cracks occur due to foreign substance infiltration and step roughness causing short circuits
Solution Approach 1:
An organic insulating layer is introduced as an intermediary between the anode and cathode, filling the space created by reduced distance. This insulating layer acts as a mediator that prevents direct contact between electrodes while maintaining the compact structure, thereby preventing short circuits without increasing device size.
Solution Approach 2:
The organic insulating layer serves as a preventive cushion against short circuits before they can occur. By placing this protective layer in advance between the electrodes, the design anticipates and prevents the harmful effect of electrode contact due to pinholes, cracks, or foreign substance infiltration.
2Volume of moving object
If the organic light emitting layer thickness is reduced to improve device compactness, then the device size is reduced, but the anode and cathode come into direct contact causing short circuits
Solution Approach 1:
The organic insulating layer acts as an intermediary that maintains electrical insulation between the anode and cathode. Even when the light emitting layer is thin, this insulating layer ensures that the electrodes do not come into direct contact, preventing short circuits while allowing the device to remain compact.
Solution Approach 2:
The insulating layer provides beforehand cushioning against electrical contact by being positioned between the electrodes in advance. This preventive measure ensures that even if the light emitting layer is thin or has defects, the electrodes remain electrically isolated.
3Reliability
If conventional transparent conductive materials with low resistance are used to improve current conduction, then electrical conductivity is improved, but overcurrent flows through short-circuited regions causing reduced light emission
Solution Approach 1:
The resistance parameter of the transparent conductive material is changed from low resistance to high resistance. This parameter change allows the material to maintain good current conduction for normal operation while limiting the current that can flow through short-circuited regions, preventing overcurrent damage and maintaining light emission.
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 high-resistance first electrode effectively prevents short circuits, ensuring consistent light emission and improving the reliability and quality of the lighting apparatus by regulating current flow and maintaining luminance.
Implementation Method 1
an organic light emitting device which includes an anode, a cathode, and an organic light emitting layer
Data Source
AI summary
A lighting apparatus according to an embodiment of the present invention includes an organic light emitting device including a first electrode, an organic light emitting layer, and a second electrode formed on a first substrate, wherein the first electrode is formed of a transparent conductive material having a resistance of approximately 2800Ω to 5500Ω in each pixel. Thus, even if the resistance of the organic light emitting layer is removed in a pixel due to a contact between the first electrode and the second electrode, overcurrent may be prevented from being applied to the pixel due to the resistance of the first electrode.