OLED Barrier Thin-Film Delamination via Laser Heating
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Solution Overview
Problem
Conventional OLED display manufacturing methods form barrier thin-films at low temperatures, resulting in low density and reduced flexibility, making it difficult to prevent moisture and oxygen infiltration effectively, which can lead to damage and limit the use of OLEDs as flexible displays.
Innovation Solution
A method involving the formation of a high-density barrier thin-film by evaporating materials at elevated temperatures on donor glass, followed by bonding with an OLED unit on acceptor glass and delaminating using a laser beam, allowing for efficient moisture prevention with reduced thickness and enhanced flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If barrier thin-film is formed at low temperature, then formation process is simple, but film density is low and flexibility is reduced
Solution Approach 1:
The patent changes the temperature parameter from conventional low temperature to high temperature (500-700°C) during barrier thin-film formation. This parameter change increases film density and improves moisture/oxygen barrier properties while maintaining process feasibility through controlled heating environments.
Solution Approach 2:
The patent employs composite barrier thin-film structures combining multiple materials (e.g., aluminum oxide, silicon oxide, titanium oxide in alternating layers) to achieve high density and superior barrier properties. The composite structure leverages the complementary characteristics of different materials to prevent moisture and oxygen infiltration effectively.
2Reliability
If barrier thin-film thickness is increased to prevent moisture infiltration, then moisture prevention improves, but flexibility and thinness are reduced
Solution Approach 1:
By changing the deposition temperature parameter to high temperature ranges, the patent achieves high-density film formation with superior barrier properties at reduced thickness. The high-temperature process creates tightly packed atomic structures that provide excellent moisture barrier performance in thinner films.
Solution Approach 2:
The patent uses multi-layer composite structures where alternating layers of different barrier materials create a tortuous path for moisture and oxygen molecules. This composite approach achieves enhanced barrier performance at reduced overall thickness compared to single-layer structures.
3Reliability
If high-temperature process is used to form high-density barrier thin-film, then moisture prevention improves, but OLED organic layers may be damaged
Solution Approach 1:
The patent segments the manufacturing process into distinct stages: forming the barrier thin-film at high temperature on the substrate first, then depositing the OLED organic layers at lower temperatures afterward. This temporal and functional segmentation allows each component to be optimized for its specific temperature requirements, protecting the organic layers from high-temperature damage while achieving high-density barrier films.
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 achieves effective moisture and oxygen prevention with a high-density, thin barrier thin-film, enabling the use of OLEDs as flexible displays while maintaining reliability and flexibility.
Implementation Method 1
irradiating a laser beam on the barrier thin-film to delaminate the donor glass from the barrier thin-film
Implementation Method 2
evaporating a material to form a barrier thin-film on the donor glass through a high-temperature process
Data Source
AI summary
A method of manufacturing an OLED display is disclosed. In one aspect, the method includes providing a donor substrate including a material formed on one surface thereof and heating the material so as to form a barrier thin-film on the donor substrate. The method also includes providing an acceptor substrate and a substrate attached to the acceptor substrate, forming an OLED unit over the substrate, bonding the OLED unit and the barrier thin-film together, and irradiating a laser beam on the barrier thin-film so as to delaminate the donor substrate from the barrier thin-film.