Transparent OLED Sealing Getter for Moisture Barrier Durability
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Solution Overview
Problem
Organic light emitting display devices are vulnerable to water and oxygen permeation, leading to reduced lifespan and reliability, and existing sealing technologies do not adequately address the need for high transparency and durability in transparent OLEDs.
Innovation Solution
Incorporating a getter with modified magnesium oxide particles, treated with an amino silane-based compound and a compound containing an acrylate and methacrylate group, as a dam structure and filling part to enhance water resistance and light transmittance, while maintaining transparency and dispersibility in a base resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sealing materials are used to protect organic light emitting diodes from water and oxygen, then reliability is improved, but transparency deteriorates
Solution Approach 1:
The patent uses a composite sealing material comprising a transparent resin and magnesium oxide particles. The resin provides transparency and structural integrity, while the magnesium oxide particles provide water and oxygen barrier properties. This composite structure achieves both transparency and protection from permeation simultaneously.
2Reliability
If the amount of getter is increased to improve water resistance, then reliability is improved, but transparency deteriorates due to aggregation
Solution Approach 1:
The patent modifies the surface properties of magnesium oxide particles through silane treatment, changing their surface energy and dispersibility. This parameter change allows higher concentrations of getter particles to be dispersed uniformly in the resin without aggregation, maintaining transparency while improving water resistance.
Solution Approach 2:
The silane treatment creates a localized modification on the surface of magnesium oxide particles, providing both dispersibility in the resin and maintained water absorption capability. This local quality enhancement allows the particles to function effectively at higher concentrations without compromising transparency.
3Illumination intensity
If transparent sealing materials are used to maintain visibility, then transparency is improved, but resistance to water and oxygen permeation deteriorates
Solution Approach 1:
The patent combines a transparent resin matrix with magnesium oxide particles to create a composite sealing material. The resin ensures transparency and structural continuity, while the dispersed magnesium oxide particles provide the water and oxygen barrier function, achieving both optical and protective properties simultaneously.
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 significantly improves the lifespan and durability of organic light emitting display devices by maintaining high transparency and resistance to water permeation, even with increased getter amounts, thereby enhancing display quality and reliability.
Implementation Method 1
The getter is composed of magnesium oxide particles whose surfaces are modified into a first surface modification part made of an amino silane-based compound
Implementation Method 2
The getter has excellent resistance to water and oxygen permeation and improved light transmittance
Data Source
AI summary
An organic light emitting display device may include a filling part filling a space between a second substrate and an organic light emitting diode, and a dam structure disposed in a non-display area and surrounding the filling part. At least one of the dam structure and the filling part includes a getter. The getter of the present disclosure is composed of magnesium oxide particles whose surfaces are modified into a first surface modification part made of an amino silane-based compound and a second surface modification part bound to the first surface modification part and made of a compound containing an acrylate group and a methacrylate group. Accordingly, it is possible to provide an organic light emitting display device that has high transparency and of which optical properties and durability are improved by minimizing permeation of water and oxygen.