Overlapping Discharge Holes in Display Device Insulation
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Solution Overview
Problem
In display devices, the chemical decomposition of organic insulating layers generates gases that can damage light emitting elements, leading to pixel shrinkage and reduced lifespan due to inadequate gas discharge pathways.
Innovation Solution
The display device incorporates a substrate with a non-display area featuring organic insulating layers and conductive layers with discharge holes, where the transparent conductive layer's discharge holes overlap those of the first conductive layer, creating a direct path for gas discharge, preventing damage to the light emitting element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic insulating layers are used to insulate between stacked conductive layers, then insulation between conductive layers is achieved, but gas generation from chemical decomposition damages light emitting elements
Solution Approach 1:
The patent extracts the harmful gas from the system by providing dedicated discharge pathways. Discharge holes are formed through the conductive layers and organic insulating layers to allow gas to escape from the encapsulation structure, preventing gas accumulation and damage to the light emitting element while maintaining the insulation function of the organic insulating layers.
Solution Approach 2:
The patent introduces an intermediary gas discharge mechanism consisting of discharge holes and optional gas barrier layers. This intermediary structure mediates between the gas-generating organic insulating layers and the light emitting element, allowing controlled gas evacuation while protecting the sensitive light emitting element from direct gas exposure.
2Device complexity
If conventional encapsulation structures are used, then device simplicity is maintained, but gas discharge pathways are insufficient leading to pixel shrinkage and dark spots
Solution Approach 1:
The patent segments the encapsulation structure by introducing multiple discharge holes at different locations and depths. The conductive layers are divided to create separate discharge pathways, and organic insulating layers are selectively removed or modified at discharge hole locations. This segmentation creates effective gas escape routes while maintaining overall structural integrity and preventing pixel 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
This configuration ensures smooth gas discharge from the organic insulating layers, protecting the light emitting element and extending its lifespan by preventing gas-induced damage.
Implementation Method 1
a first conductive layer disposed on the first organic insulating layer and including first discharge holes, a second organic insulating layer disposed on the first conductive layer, and a transparent conductive layer disposed on the second organic insulating layer and including second discharge holes that respectively overlap the first discharge holes
Data Source
AI summary
A display device may include a substrate including a display area and a non-display area surrounding at least a portion of the display area, a first organic insulating layer disposed on the substrate in the non-display area, a first conductive layer disposed on the first organic insulating layer and including first discharge holes, a second organic insulating layer disposed on the first conductive layer, and a transparent conductive layer disposed on the second organic insulating layer and including second discharge holes that respectively overlap the first discharge holes.