Hydrogen Blocking Layer in Light Emitting Display Planarization
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Solution Overview
Problem
Light emitting display apparatuses face reliability issues due to water and moisture penetration, which can degrade the encapsulation layer and lead to hydrogen penetration into thin film transistors, causing image quality problems like white bands.
Innovation Solution
Incorporating a first hydrogen blocking layer in the planarization layer that overlaps the thin film transistor to prevent hydrogen generated in the encapsulation layer from penetrating into the transistor, and a barrier structure to isolate the light emitting device layer from water and moisture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the encapsulation layer is made thinner to reduce device complexity, then manufacturing precision may improve, but reliability deteriorates due to increased hydrogen penetration into thin film transistors
Solution Approach 1:
A hydrogen blocking layer is introduced as an intermediary component between the encapsulation layer and the thin film transistor. This layer specifically blocks hydrogen diffusion paths, allowing the encapsulation layer to remain thin while preventing hydrogen from reaching the transistor, thus resolving the contradiction between reduced complexity and maintained reliability
Solution Approach 2:
The protection function is segmented into multiple specialized layers: the encapsulation layer handles moisture barrier functions, while the dedicated hydrogen blocking layer handles hydrogen diffusion prevention. This segmentation allows each layer to be optimized for its specific function, enabling thin encapsulation while maintaining reliability through the specialized hydrogen blocking layer
2Reliability
If the encapsulation layer is present to prevent moisture penetration, then reliability improves, but hydrogen generated in the encapsulation layer penetrates into the thin film transistor causing image quality degradation
Solution Approach 1:
The hydrogen blocking layer serves as an intermediary that intercepts hydrogen atoms generated within the encapsulation layer, preventing them from reaching the thin film transistor. This resolves the contradiction by maintaining the encapsulation layer's moisture protection function while adding a dedicated barrier against hydrogen diffusion
Solution Approach 2:
The hydrogen atoms generated as a byproduct of the encapsulation layer are converted from a harmful factor into a contained element. The hydrogen blocking layer captures these hydrogen atoms, preventing them from causing transistor degradation, thus transforming the harmful hydrogen generation into a controlled and harmless process
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 solution effectively prevents hydrogen penetration, enhancing the reliability of the light emitting display panel and maintaining image quality by blocking moisture and hydrogen, thus reducing the occurrence of image degradation issues such as white bands.
Implementation Method 1
a first hydrogen blocking layer in the planarization layer and overlapping the thin film transistor
Implementation Method 2
a barrier structure to isolate the light emitting device layer from water and moisture
Data Source
AI summary
A light emitting display apparatus includes a substrate having thereon a display area, a circuit layer disposed on the display area of the substrate and including a thin film transistor, a planarization layer disposed on the circuit layer, a light emitting device layer including a pixel electrode disposed on the planarization layer, and a first hydrogen blocking layer in the planarization and overlapping the thin film transistor.