SnO Transparent Electrode for OLED Resistance Heat Reduction
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Solution Overview
Problem
The high surface resistance of traditional ITO or IZO transparent electrodes in organic light emitting display devices generates significant resistance heat, leading to increased heat loss and premature degradation of subpixels during operation.
Innovation Solution
A method involving the formation of a transparent electrode using a SnO material through a plasma coating process, where argon gas and oxygen are injected in specific ratios within a controlled chamber pressure to achieve a surface resistance of 20 Ω/□ or lower, reducing resistance heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ITO or IZO material is used for transparent electrode, then transparency is maintained, but surface resistance is high (50 Ω/□ or higher) causing excessive resistance heat
Solution Approach 1:
The patent changes the material composition parameters by using SnO with specific oxygen content (5-40 at%) instead of conventional ITO or IZO materials. This parameter change in material composition directly reduces the surface resistance from 50 Ω/□ or higher to below 50 Ω/□, thereby reducing resistance heat generation while maintaining transparency and improving device reliability
Solution Approach 2:
The patent employs a composite material approach by creating a transparent electrode with SnO as the base material and controlled oxygen content, forming a novel material composition that combines the transparency of oxide materials with the low resistance characteristics of tin oxide, achieving both optical and electrical performance requirements
2Ease of manufacture
If high surface resistance transparent electrode is used, then manufacturing is simpler, but heat loss increases and subpixel properties degrade quickly
Solution Approach 1:
The patent modifies the material parameters by controlling oxygen content in SnO within the range of 5-40 at%, which optimizes the electrical conductivity while maintaining the manufacturing process simplicity. This parameter optimization extends the operational duration of subpixels by reducing heat-induced degradation
Solution Approach 2:
The patent replaces the conventional ITO/IZO materials with SnO-based materials that can be manufactured through simpler processes, effectively creating a more durable transparent electrode that extends device lifespan despite the relatively new material system
3Loss of energy
If oxygen content in SnO is increased to reduce resistance, then surface resistance decreases, but material composition stability may be affected
Solution Approach 1:
The patent establishes an optimal parameter range for oxygen content (5-40 at%) in SnO material, which balances the reduction of surface resistance with the maintenance of material composition stability. This controlled parameter change achieves low resistance heat generation while preserving material integrity
Solution Approach 2:
The patent implements compositional control through monitoring and adjusting oxygen content during the sputtering process, using feedback mechanisms to maintain oxygen content within the optimal 5-40 at% range, thereby simultaneously achieving low resistance and compositional stability
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 method effectively reduces resistance heat and prevents early degradation of subpixels, enhancing the reliability and performance of organic light emitting display devices by maintaining a low surface resistance of the transparent electrode.
Implementation Method 1
evaporating the SnO member to be deposited on the substrate
Implementation Method 2
forming plasma around the SnO member and evaporating the SnO member by heat of the plasma
Data Source
AI summary
A method for manufacturing an organic light emitting display device includes mounting in a chamber a substrate where a transparent electrode is to be formed and a SnO member that is a source of forming the transparent electrode, injecting argon gas and oxygen into the chamber, and evaporating the SnO member to be deposited on the substrate.