OLED Pad Protection Layer for Corrosion and Adhesion
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Solution Overview
Problem
Organic light-emitting display apparatuses face challenges in achieving a balance between adhesive force and corrosion resistance, particularly in the pad region where metal electrodes are exposed, leading to reliability issues and high defective rates.
Innovation Solution
The implementation of a stack structure protection layer using transparent conductive oxides, semi-transmissive metal layers, and additional transparent conductive oxides, along with specific masking operations to pattern and expose conductive layers, enhances adhesive force and corrosion resistance in the organic light-emitting display apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal electrodes are exposed in the pad region, then electrical conductivity is improved, but corrosion resistance deteriorates
Solution Approach 1:
The patent applies composite materials by creating a multi-layer protection layer structure consisting of transparent conductive oxide layers and metal layers. This composite structure provides both corrosion protection and electrical conductivity, resolving the contradiction between protecting exposed metal electrodes and maintaining electrical functionality in the pad region.
Solution Approach 2:
The protection layer is selectively formed only in the pad region where metal electrodes are exposed, rather than uniformly across the entire device. This local application provides corrosion protection precisely where needed while maintaining electrical conductivity in the exposed areas, addressing the specific harmful exposure issue without compromising overall device performance.
2Reliability
If protection layer is added to protect metal electrodes, then corrosion resistance is improved, but adhesive force deteriorates
Solution Approach 1:
The multi-layer composite structure of transparent conductive oxide and metal layers provides corrosion protection while maintaining adhesive force. The specific combination of materials and their layered arrangement creates a protection system that bonds effectively to the underlying metal electrodes while resisting corrosion from external substances.
Solution Approach 2:
The transparent conductive oxide layers act as intermediary layers between the metal electrodes and the external environment. These intermediary layers provide corrosion protection while maintaining electrical conductivity and adhesive bonding, resolving the contradiction between protection and adhesion.
3Reliability
If transparent conductive oxide layer is applied, then corrosion resistance is improved, but electrical conductivity deteriorates
Solution Approach 1:
The patent uses a composite structure where transparent conductive oxide layers are combined with metal layers. The transparent conductive oxide provides corrosion resistance, while the metal layers maintain electrical conductivity. This composite approach resolves the contradiction by distributing functions across different material layers.
Solution Approach 2:
The transparent conductive oxide layers are applied specifically in regions where corrosion protection is needed while maintaining electrical conductivity requirements. The local application and thickness control ensure that corrosion protection is achieved without significantly compromising electrical conductivity in the pad region.
Data Source
AI summary
An organic light-emitting display apparatus includes an active layer of a thin film transistor (TFT), a gate electrode including a transparent conductive material or a metal that on the active layer, a first insulating layer on the substrate, source and drain electrodes electrically connected to the active layer, a second insulating layer between the gate electrode and the source and drain electrodes, a first conductive layer of a transparent conductive material on the first insulating layer, a second conductive layer on the first conductive layer, the second conductive layer being a metal, a third conductive layer on the second conductive layer, the third conductive layer being made of a same material as the source and drain electrodes, and being connected to the first conductive layer; and a protection layer that includes a transparent conductive oxide, the protection layer being on the third conductive layer.