Thin Film Encapsulation Layer for Flexible OLED Protection
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Solution Overview
Problem
Organic light-emitting diode display panels are sensitive to water vapor and oxygen, leading to shortened lifespan and reduced efficiency, and existing designs struggle to achieve thin, lightweight, and flexible structures with enhanced bending performance.
Innovation Solution
A display panel structure incorporating a thin film encapsulation layer with multiple inorganic and hardening layers, including silicon nitride and silicon oxide, along with an organic planarization layer and dam material layers, to create a protective cover window and encapsulation structure that blocks water vapor and oxygen, while maintaining ultra-thin thickness and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a conventional stacked structure with separate touch layers and cover window is used, then the display panel provides good protection and functionality, but the structure becomes too thick and heavy, reducing bending performance and portability
Solution Approach 1:
The patent combines the cover window and encapsulation structure into a single integrated thin film encapsulation layer. This merging eliminates the need for separate touch layers and cover windows, reducing overall thickness while maintaining protection functionality through multiple inorganic and organic layers that provide both structural integrity and environmental barrier properties
Solution Approach 2:
The thin film encapsulation layer uses composite material structure with alternating inorganic layers (silicon nitride, silicon oxide) and organic layers (hardening layers, planarization layer). This composite structure provides both mechanical strength and flexibility while achieving ultra-thin thickness, resolving the contradiction between thinness and protective reliability
2Strength
If the display panel is made thinner and more flexible to improve bending performance, then portability and flexibility are enhanced, but protection against water vapor and oxygen becomes insufficient
Solution Approach 1:
The patent employs thin film encapsulation structure with alternating inorganic and organic layers that provides flexibility and bendability. The thin film design enables the display panel to achieve superior bending performance while the multi-layer composite structure maintains effective barrier properties against water vapor and oxygen penetration
Solution Approach 2:
The composite material structure with inorganic layers (silicon nitride, silicon oxide) and organic hardening layers creates a flexible yet protective encapsulation system. The inorganic layers provide barrier properties against harmful substances while the organic layers provide flexibility and stress relief, enabling both thinness and protection
3Reliability
If multiple protective layers are added to improve encapsulation and protection, then reliability and protection are enhanced, but the manufacturing process becomes more complex and costly
Solution Approach 1:
The encapsulation structure is segmented into multiple functional layers with distinct roles: inorganic layers for barrier protection, organic hardening layers for mechanical strength and flexibility, and planarization layers for surface quality. This segmentation allows each layer to be optimized independently while simplifying the overall manufacturing process through specialized deposition techniques for each layer type
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 solution effectively extends the lifespan of the display panel by protecting it from environmental factors, simplifies the manufacturing process, reduces production costs, and achieves the desired thin and flexible form while maintaining high bending performance.
Implementation Method 1
a first inorganic layer, a first hardening layer disposed on the first inorganic layer, a second inorganic layer disposed on the first hardening layer... to create a protective cover window and encapsulation structure that blocks water vapor and oxygen
Implementation Method 2
an organic planarization layer disposed on the second inorganic layer
Implementation Method 3
a first hardening layer disposed on the first inorganic layer... a second hardening layer disposed on the organic planarization layer... a third hardening layer disposed on the third inorganic layer
Data Source
AI summary
A display panel and a manufacturing method thereof are provided. The display panel includes a substrate, a thin film transistor (TFT) device layer, a luminescent device layer, and a thin film encapsulation layer, wherein the thin film encapsulation layer includes a first inorganic layer, a first hardening layer disposed on the first inorganic layer, a second inorganic layer disposed on the first hardening layer, an organic planarization layer disposed on the second inorganic layer, a second hardening layer disposed on the organic planarization layer, a third inorganic layer disposed on the second hardening layer, and a third hardening layer disposed on the third inorganic layer, thereby realizing a cover window and encapsulation structure characteristics at the same time, and achieving ultra-thin encapsulation.