OLED Encapsulation Auxiliary Layer for Particle Damage Protection
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Solution Overview
Problem
Conventional OLED display panels face reliability and lifetime issues due to insufficient water and oxygen barrier effects caused by particles during the thin film encapsulation process, which damages the encapsulation and allows moisture and oxygen permeation.
Innovation Solution
A display panel structure incorporating a substrate, luminous display array, thin film encapsulation, auxiliary layer with Shore hardness ranging from D4 to D60, optical film, and optical clear adhesive, where the auxiliary layer is formed with a specific Shore hardness and elastic modulus to provide a buffer and protection effect, preventing damage during the optical film attachment process and maintaining the water-resistant effect of the thin film encapsulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thin film encapsulation is formed on OLED devices to block water and oxygen, then the water and oxygen barrier effect is improved, but particles during fabrication damage the encapsulation and deteriorate the barrier effect
Solution Approach 1:
The patent introduces an auxiliary layer with specific Shore hardness (D4-D60) and elastic modulus (10-3000 MPa) positioned between the thin film encapsulation and the optical film. This auxiliary layer acts as a cushioning buffer that absorbs mechanical stress and prevents particle-induced damage during the optical film attachment process, thereby protecting the encapsulation's water and oxygen barrier integrity before damage can occur.
Solution Approach 2:
The auxiliary layer serves as an intermediary element between the thin film encapsulation and the optical film. It mediates the mechanical interaction during attachment, distributing stress evenly and preventing direct transmission of harmful forces to the encapsulation layer, thus maintaining the barrier effect while allowing the optical film to be properly attached.
2Strength
If the auxiliary layer has high hardness to provide protection, then the protection effect is improved, but the thin film encapsulation may be damaged due to excessive rigidity
Solution Approach 1:
The patent specifies precise parameter ranges for the auxiliary layer: Shore hardness of D4-D60 and elastic modulus of 10-3000 MPa. These parameter changes create an optimal balance where the auxiliary layer is soft enough to flex with the thin film encapsulation without causing stress concentration or damage, while still providing sufficient cushioning protection against external forces during optical film attachment.
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 auxiliary layer effectively reduces water vapor transmission rates, enhancing the reliability and lifetime of the display panel by protecting the thin film encapsulation from damage and maintaining its water-resistant properties.
Implementation Method 1
the auxiliary layer has an even top surface and a Shore hardness substantially ranging from D4 to D60... having a specific Shore hardness and elastic modulus to provide a buffer and protection effect
Data Source
AI summary
A display panel includes a substrate, a luminous display array, a thin film encapsulation, an auxiliary layer, an optical film and an optical clear adhesive. The luminous display array is disposed on the substrate. The thin film encapsulation layer is disposed on the substrate, covering the luminous display array. The auxiliary layer is disposed on the then thin film encapsulation. The auxiliary layer has an even top surface, and a shore hardness ranging from D4 to D60. The optical film is disposed on the auxiliary layer. The optical clear adhesive is disposed on the even top surface of the auxiliary layer for attaching the auxiliary layer and the optical film.