OLED Barrier Coating with Reduced Deposition Time
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Solution Overview
Problem
Existing methods for sealing electronic devices, such as OLEDs, are either costly or time-consuming, as they rely on glass and metal caps with epoxy sealants or thin film encapsulation, which do not efficiently protect against environmental degradation like water vapor and oxygen.
Innovation Solution
A method involving the deposition of graded zones of organic and inorganic materials at increased rates to form a barrier with a water vapor transmission rate less than 10−3 g/m2/day, reducing the process time to 20 minutes or less, thereby protecting electronic devices from adverse environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thin film encapsulation is used to protect against environmental degradation, then protection effectiveness is improved, but process time increases
Solution Approach 1:
The patent changes the deposition rate parameter from conventional slow rates to high rates exceeding 25 nm/min, enabling the barrier coating to be formed in 20 minutes or less while achieving water vapor transmission rates below 10^-3 g/m²/day, thus resolving the contradiction between protection effectiveness and process time
Solution Approach 2:
The patent employs composite barrier coatings combining organic and inorganic materials in graded zones, where organic materials provide flexibility and adhesion while inorganic materials provide barrier properties, achieving both high protection effectiveness and rapid deposition
2Reliability
If glass and metal caps with epoxy sealants are used for encapsulation, then protection against environmental conditions is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive glass and metal cap encapsulation with a cost-effective thin film barrier coating that can be deposited directly on the OLED structure, achieving comparable protection at lower material and processing costs
Solution Approach 2:
The patent extracts the essential barrier function from bulky glass and metal encapsulation structures, implementing it through thin film deposition that provides the same protection against water vapor and oxygen without the associated cost and complexity
3Manufacturing precision
If conventional deposition rates are used for organic materials, then material quality is maintained, but deposition time increases
Solution Approach 1:
The patent dramatically increases the deposition rate parameter for organic materials to exceed 25 nm/min while maintaining material quality through controlled deposition processes, achieving both high productivity and manufacturing precision
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 approach provides a cost-effective and time-efficient barrier that maintains the integrity of OLEDs by significantly reducing degradation, ensuring image quality and uniformity while being more efficient than traditional encapsulation methods.
Implementation Method 1
depositing substantially organic materials to form an organic zone or zones at an organic material deposition rate greater than 25 nm/min
Data Source
AI summary
The present techniques provide systems and methods for protecting electronic devices such as organic light emitting devices (OLEDs) from adverse environmental effects using a thin film encapsulation with reduced process time. In some embodiments, the process time of forming a graded barrier over the OLED structure may take less than 5 minutes, and may result in substantially similar barrier properties as those of metal and epoxy sealants and/or typical thin film encapsulations. The process time of forming the barrier may be reduced by increasing deposition rates for organic and/or inorganic materials, reducing the thicknesses of organic and/or inorganic layers, and/or varying the number of zones in the barrier.