Light-Diffusing Barrier Film for OLED Moisture Protection
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Solution Overview
Problem
Existing barrier films used in devices with organic light-emitting materials or backlight units face durability issues when exposed to moisture or oxygen, and current manufacturing methods, such as roll-to-roll processes, can damage the barrier layer, compromising its properties and requiring separate adhesive layers.
Innovation Solution
A light-diffusive barrier film with a light-diffusing layer, a base layer, and a barrier layer, where the light-diffusing layer has predetermined surface roughness to reduce static electricity and prevent damage to the barrier layer during the roll-to-roll process, eliminating the need for a separate adhesive layer and ensuring excellent barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a barrier film is produced by dry coating such as vapor deposition, then thin film uniformity is improved, but manufacturing cost increases and large-area production becomes difficult
Solution Approach 1:
The patent replaces the mechanical vapor deposition process with a chemical solution coating process. The barrier layer is formed by coating a solution containing inorganic particles onto the light-diffusing layer, followed by drying and heat treatment. This substitution enables large-area production while maintaining barrier properties, resolving the contradiction between manufacturing precision and productivity.
2Productivity
If pressure is applied in the roll-to-roll process for winding or unwinding the film, then mass production is enabled, but the barrier layer is damaged and barrier property deteriorates
Solution Approach 1:
The patent applies a protective adhesive layer over the barrier layer before the roll-to-roll process. This adhesive layer acts as a cushion that absorbs and distributes the pressure applied during winding and unwinding, preventing direct damage to the barrier layer. This allows mass production to proceed while maintaining barrier properties, resolving the contradiction between productivity and reliability.
3Illumination intensity
If a separate adhesive layer is used to attach the light-diffusing sheet to the barrier film, then light diffusion function is improved, but device complexity and manufacturing steps increase
Solution Approach 1:
The patent merges the adhesive layer and light-diffusing layer into a single integrated layer. The adhesive layer contains light-diffusing particles that provide both adhesion to the barrier film and light diffusion functionality. This consolidation reduces the number of separate layers and manufacturing steps while maintaining both the adhesive bonding and light diffusion functions, resolving the contradiction between illumination intensity and device complexity.
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 film maintains excellent barrier properties against moisture and oxygen while allowing for large-area mass production and simplifying the manufacturing process, preventing damage during the roll-to-roll process and ensuring effective light diffusion.
Implementation Method 1
the light-diffusing layer has predetermined surface roughness to reduce static electricity and prevent damage to the barrier layer during the roll-to-roll process
Implementation Method 2
A barrier film can be used for such a device in order to protect the device from the external environment
Data Source
AI summary
Provided is a light-diffusing barrier film. The film is an integral film comprising a barrier layer, a base layer and a light-diffusing layer, sequentially. The film can prevent moisture penetration into a device such as an organic light emitting device, and also imparts a light-diffusing function to the device. In particular, the film can have excellent moisture blocking properties even after a roll-to-roll process.