OLED Contamination Preventing Layer for Yield Improvement
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Solution Overview
Problem
The existing OLED displays face challenges in preventing contamination and surface damage during the manufacturing process, particularly when detaching the optical film from the thin film encapsulation layer, due to adherence issues which can lead to product yield reduction.
Innovation Solution
Incorporating a contamination preventing layer with a hydrophobic surface, made of materials like fluorine-containing compounds, between the thin film encapsulation layer and the optical film, which has weaker adherence than the adhesive layer, to prevent contamination and damage during the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the optical film is directly attached to the thin film encapsulation layer, then the manufacturing process is simpler, but contamination and surface damage occur during detachment
Solution Approach 1:
A contamination preventing layer is introduced as an intermediary between the thin film encapsulation layer and the optical film. This intermediate layer prevents direct contact and adhesion between the encapsulation layer and optical film, eliminating contamination and surface damage during detachment while maintaining manufacturing simplicity.
2Strength
If the adhesive layer has strong adherence to ensure bonding, then bonding strength is improved, but surface damage occurs during optical film detachment
Solution Approach 1:
The contamination preventing layer serves as a mediator that interrupts the adhesion pathway between the adhesive layer and the thin film encapsulation layer. During optical film detachment, the contamination preventing layer separates first due to its weaker adhesion to the encapsulation layer, protecting the encapsulation layer surface from damage while the adhesive layer maintains its bonding strength to the optical film.
3Device complexity
If no contamination preventing layer is used, then the device structure is simpler, but contamination and surface damage reduce product yield
Solution Approach 1:
The contamination preventing layer is a thin intermediate layer that adds minimal structural complexity while providing critical protection against contamination and surface damage. This simple additional layer significantly improves product yield by preventing defects during the optical film detachment process.
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 contamination and surface damage of the thin film encapsulation layer, improving product yield by facilitating easy separation of the optical film and maintaining the integrity of the encapsulation layer.
Implementation Method 1
A surface of the contamination preventing layer contacting the adhesive layer may be more hydrophobic than the thin film encapsulation layer. The surface of the contamination preventing layer may have a contact angle of about 100 to 200 degrees with respect to water.
Data Source
AI summary
An OLED display may include: a substrate; an organic light emitting diode on the substrate; a thin film encapsulation layer encapsulates the organic light emitting diode with the substrate; an optical film on the thin film encapsulation layer and including an adhesive layer opposite to the thin film encapsulation layer; and a contamination preventing layer between the thin film encapsulation layer and the optical film, the contamination preventing layer contacting the adhesive layer.