Organic Light-Emitting Element With Temperature-Dependent Short Circuit Prevention
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Solution Overview
Problem
Organic light emitting devices are prone to short circuit defects due to structural imperfections and organic layer thickness variations, leading to reduced light output and display quality issues, with conventional methods increasing manufacturing costs without fully addressing the problem.
Innovation Solution
Incorporating a short circuit prevention layer with a resistance value that increases with temperature, positioned between the first and auxiliary electrodes, to control leakage current and maintain device functionality even with short circuit defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the interval between the anode and cathode is increased to prevent short circuit defects, then short circuit defects are reduced, but the thickness of the organic layer increases beyond what is actually necessary, causing increased manufacturing cost
Solution Approach 1:
An auxiliary electrode is introduced as an intermediary element between the anode and cathode. This auxiliary electrode, positioned closer to the anode, serves as a early detection point for short circuit defects. By detecting leakage current at this intermediate position, the system can identify defects before they cause complete device failure, allowing for reduced anode-cathode spacing while maintaining reliability.
Solution Approach 2:
The patent replaces the mechanical approach of increasing physical distance (anode-cathode interval) with an electrical detection mechanism. Instead of relying on spatial separation to prevent short circuits, the system uses electrical field sensing through the auxiliary electrode to detect and respond to leakage current, enabling thinner device structures without sacrificing reliability.
2Reliability
If the interval between the anode and cathode is increased to prevent short circuit defects, then short circuit defects are reduced, but the device thickness increases, leading to reduced productivity
Solution Approach 1:
The auxiliary electrode acts as an intermediary detection point that enables early identification of short circuit defects. This allows for optimized device thickness without compromising reliability, as defects are detected electrically rather than relying on increased physical spacing, thereby maintaining thin device profiles and high manufacturing efficiency.
3Reliability
If a short circuit defect occurs, then current flows through the low-resistance path, but light output is reduced or lost, causing degradation in display quality
Solution Approach 1:
The auxiliary electrode provides feedback about the electrical state of the device by detecting leakage current. When a short circuit defect begins to form, the auxiliary electrode detects the leakage current and can trigger responses (such as adjusting operating parameters or alerting to the defect) that prevent complete device failure and maintain light output quality.
Solution Approach 2:
The auxiliary electrode is positioned to detect leakage current before it causes complete short circuit failure. By detecting the early stages of defect formation, the system can take preventive measures or adjust operation to cushion against complete failure, thereby maintaining device operation stability and light output even in the presence of developing defects.
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 controls leakage current and maintains device operation even with short circuit defects, preventing excessive current flow to defective areas and reducing the risk of device failure, while minimizing increased operating voltage and manufacturing costs.
Implementation Method 1
the short circuit prevention layer has a resistance value which is greater at 50 or more ° C. than 25° C.
Implementation Method 2
An organic light emitting phenomenon denotes a phenomenon where electrical energy is converted into light energy by using an organic material
Data Source
AI summary
An embodiment of the present specification provides an organic light emitting device including: a first electrode; a second electrode provided opposite to the first electrode; one or more organic material layers provided between the first electrode and the second electrode; an auxiliary electrode provided in the first electrode; and a short circuit prevention layer provided between the first electrode and the auxiliary electrode, wherein the short circuit prevention layer has a resistance value which is greater at 50 or more ° C. than 25° C. The organic light emitting device controls the amount of leakage current when a short circuit defect occurs, thereby solving a problem where a device does not overall operate. The organic light emitting device stably operates without an increase in the amount of leakage current.