Flexible OLED Encapsulation with Trapezoidal Organic Layer
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Solution Overview
Problem
Conventional organic light emitting diode (OLED) displays have poor encapsulation reliability due to water and oxygen diffusion, leading to a short lifespan and low efficiency.
Innovation Solution
A flexible OLED display manufacturing method involving the sequential formation of an active array layer, an organic light emitting layer, a trapezoidal organic layer with specific angle and thickness, and an inorganic layer on a flexible substrate, using inorganic and organic materials to enhance encapsulation reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional encapsulation layer is used, then the manufacturing process is simple, but water and oxygen diffuse through the layer causing poor encapsulation reliability
Solution Approach 1:
The encapsulation structure is divided into multiple functional layers: a protective layer (inorganic material) for barrier function, an organic layer with trapezoidal cross-section for stress distribution, and an inorganic layer for additional protection. This segmentation allows each layer to perform its specific function optimally, preventing water and oxygen diffusion while maintaining manufacturing feasibility
Solution Approach 2:
The patent uses composite material structures combining inorganic materials (for barrier properties against water and oxygen) and organic materials (for flexibility and stress management). The protective layer uses inorganic materials like silicon oxide or silicon nitride, while the organic layer provides mechanical compliance, creating a composite encapsulation system that addresses both protection and flexibility requirements
2Duration of action of stationary object
If the organic layer has a vertical cross section, then the manufacturing process is simple, but stress concentration causes cracking and reduces lifespan
Solution Approach 1:
The organic layer is designed with a trapezoidal cross-section instead of a vertical rectangular shape. This geometric modification creates angled surfaces that distribute stress more evenly across the layer, preventing stress concentration at vertical edges that would lead to cracking. The angled geometry smoothly transitions stress loads, extending the OLED lifespan while the specific angle requirements (45-60 degrees) provide clear manufacturing targets
3Reliability
If the protective layer is too thin, then manufacturing is easier, but it cannot effectively block water and oxygen diffusion
Solution Approach 1:
The patent specifies optimal thickness parameters for the protective layer (50-200 nm) to achieve effective barrier performance against water and oxygen diffusion. This parameter optimization ensures sufficient protection while maintaining manufacturability through standard thin-film deposition processes. The specific thickness range balances barrier effectiveness with process capability
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 method improves packaging reliability and extends the lifespan of OLEDs by effectively blocking moisture and oxygen, preventing corrosion and cracking.
Implementation Method 1
water and oxygen molecules in the air diffuse to an organic light-emitting display layer through an encapsulation layer
Data Source
AI summary
A flexible organic light emitting diode display and a manufacturing method are provided. The method includes steps of forming an active array layer and an organic light emitting display layer sequentially on a flexible substrate, forming a protective layer on the organic light emitting display layer, forming an organic layer on the protective layer, wherein a cross section of the organic layer is trapezoidal, and forming an inorganic layer on the organic layer.