OLED Pixel Insulating Layer Outgas Discharge Structure
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Solution Overview
Problem
In high-resolution organic light-emitting display apparatuses, outgassing from organic insulating layers can lead to progressive dark spots due to inadequate discharge, causing pixel defects as inorganic insulating layers trap and intensively discharge gases through discontinuities.
Innovation Solution
The structure includes multiple conductive layers separated by insulating layers, with strategically placed openings in the inorganic and organic insulating layers to facilitate efficient gas discharge, using silicon nitride for inorganic layers and polyimide for organic layers, ensuring that outgassing occurs uniformly without concentrating in specific areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inorganic insulating layer is used to cover the organic insulating layer for protection, then the protective function is improved, but outgas discharge becomes blocked causing progressive dark spots
Solution Approach 1:
The inorganic insulating layer is designed with a porous structure containing multiple voids that allow outgas to pass through. This porous configuration maintains the protective barrier function while providing pathways for gas discharge, preventing the accumulation of outgas that would otherwise cause progressive dark spots and pixel defects.
Solution Approach 2:
The inorganic insulating layer acts as an intermediary between the organic insulating layer and the external environment. It provides protection while mediating the outgas discharge process by capturing and gradually releasing trapped gases through its void structure, preventing direct contact between the organic layer and harmful external factors.
2Reliability
If conductive layers are arranged spaced apart with insulating layers between them, then electrical insulation is improved, but spatial efficiency decreases
Solution Approach 1:
The insulating layers are selectively applied only where electrical insulation is required, rather than uniformly across the entire structure. This localized approach maintains necessary electrical isolation between conductive layers while minimizing the overall space occupied by insulating materials, improving spatial efficiency.
Solution Approach 2:
The patent extracts and removes unnecessary portions of insulating layers to create openings and voids. This extraction eliminates redundant material that would otherwise consume space, allowing conductive layers to be arranged more compactly while maintaining insulation where truly needed.
Data Source
AI summary
In an organic light-emitting display apparatus comprising a plurality of pixels, at least one of the plurality of pixels includes a first conductive layer over a substrate, a first organic insulating layer over the first conductive layer, the first organic insulating layer comprising a first opening exposing a part of the first conductive layer, a second conductive layer over the first organic insulating layer, the second conductive layer contacting the part of the first conductive layer exposed through the first opening, a first inorganic insulating layer over the first organic insulating layer to cover the second conductive layer, the first inorganic insulating layer comprising a second opening exposing at least a part of the first organic insulating layer, and a second organic insulating layer over the first inorganic insulating layer, the second organic insulating layer contacting the first organic insulating layer through the second opening.