Organic Light Emitting Display Barrier Using Block Copolymer Stacks
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Solution Overview
Problem
Existing organic light emitting displays face challenges in achieving a thin profile and durability due to the use of encapsulation substrates, which also introduce moisture penetration paths, and the manufacturing process is complex and time-consuming with the alternation of inorganic and organic layers.
Innovation Solution
An organic light emitting display is manufactured with a substrate, an organic light emitting diode, and a barrier formed using a block copolymer with first and second block monomer layers including inorganic precursors, which are alternately stacked to prevent moisture penetration and simplify the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an encapsulation substrate formed of glass or metal is used to seal the organic light emitting diode, then the durability is improved, but the profile thickness increases and moisture penetration paths are introduced
Solution Approach 1:
The patent replaces rigid encapsulation substrates (glass or metal) with thin film encapsulation layers formed directly on the substrate. This includes inorganic encapsulation layers (such as silicon oxide, silicon nitride, or aluminum oxide formed by PECVD or ALD) and organic encapsulation layers, creating a flexible thin film barrier that prevents moisture penetration while maintaining a thin profile without the thickness penalty of traditional encapsulation substrates
Solution Approach 2:
The invention extracts and eliminates the encapsulation substrate layer from the display structure, retaining only the essential encapsulation function through thin film layers. This removes the harmful thickness contribution of encapsulation substrates while preserving the protective function against moisture and oxygen
2Reliability
If inorganic layers and organic layers are alternately stacked to form a barrier, then the moisture penetration prevention is improved, but the manufacturing time increases and the structure becomes complicated
Solution Approach 1:
The patent merges the barrier function with the encapsulation function into a single integrated encapsulation structure. The inorganic encapsulation layers serve both as structural encapsulation and as moisture barrier layers, eliminating the need for separate barrier layers and reducing the number of manufacturing steps while maintaining effective moisture penetration prevention
3Temperature
If low temperature plasma enhanced chemical vapor deposition is used to stack inorganic layers, then the manufacturing temperature is reduced, but particles are produced that create penetration paths for moisture
Solution Approach 1:
The patent changes the deposition parameters and methods to reduce particle generation. This includes using alternative deposition techniques such as atomic layer deposition (ALD) or optimized PECVD processes with adjusted power, pressure, and gas flow parameters to minimize particle formation. The invention also incorporates particle removal steps or uses materials less prone to particle generation, thereby maintaining low temperature processing while preventing moisture penetration paths
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 prevents moisture degradation and simplifies the manufacturing process by forming a barrier with a stack structure of organic and inorganic layers, enhancing the durability and thin profile of the organic light emitting display.
Implementation Method 1
a barrier formed using a block copolymer with first and second block monomer layers including inorganic precursors, which are alternately stacked
Implementation Method 2
performing an annealing process on the block copolymer to form a barrier including at least one first block monomer layer and at least one second block monomer layer including the inorganic precursors
Data Source
AI summary
An organic light emitting display is discussed. The organic light emitting display includes a substrate, an organic light emitting diode positioned on the substrate, and a bather covering the organic light emitting diode. The organic light emitting diode includes a first electrode, an organic layer, and a second electrode. The barrier includes at least one first block monomer layer and at least one second block monomer layer including inorganic precursors. The at least one first block monomer layer and the at least one second block monomer layer are alternately stacked in a vertical direction.