OLED Device Using Polymer Resin and Getter for Moisture Protection
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Solution Overview
Problem
Conventional organic light emitting diode (OLED) devices face challenges in preventing moisture degradation and external impact damage, often requiring thick glass encapsulation substrates that increase device thickness and limit flexibility.
Innovation Solution
An OLED device design featuring a substrate with an organic light emitting element covered by a polymer resin layer and a getter layer containing a moisture-absorbing material and binder, which replaces traditional glass encapsulation, providing a thin, flexible, and impact-resistant solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a glass encapsulation substrate is used to prevent moisture degradation, then the organic light emitting element is protected from moisture, but the device thickness increases and flexibility is reduced
Solution Approach 1:
The patent replaces rigid glass encapsulation with a flexible polymer resin layer that forms a thin moisture barrier. The polymer resin layer (thickness: 1-10 μm) provides effective moisture protection while maintaining device flexibility and reducing overall thickness compared to traditional glass substrates.
Solution Approach 2:
The patent uses a composite structure consisting of a polymer resin layer combined with a getter layer containing moisture-absorbing materials (such as calcium oxide, barium oxide, or strontium oxide). This composite approach provides superior moisture protection by combining the barrier properties of the polymer with the moisture absorption capacity of the getter materials.
2Reliability
If a glass encapsulation substrate is used to prevent moisture degradation, then the organic light emitting element is protected from moisture, but the device becomes vulnerable to external impact damage
Solution Approach 1:
The flexible polymer resin layer replaces brittle glass encapsulation, providing both moisture protection and impact resistance. The polymer material's flexibility allows it to absorb external impacts without cracking or shattering, thereby protecting the organic light emitting element from both moisture and mechanical damage.
Solution Approach 2:
The polymer resin layer acts as a cushioning layer that absorbs and dissipates external impact energy before it reaches the organic light emitting element. This beforehand cushioning protects the sensitive organic materials from mechanical damage while maintaining effective moisture barrier properties.
3Length of stationary object
If a polymer resin layer is used instead of glass encapsulation, then device thickness is reduced and flexibility is improved, but moisture protection capability must be enhanced
Solution Approach 1:
The patent enhances the moisture protection of the thin polymer resin layer by combining it with a getter layer containing moisture-absorbing materials. This composite structure compensates for the thinner barrier thickness by adding active moisture absorption capacity, ensuring superior moisture protection despite the reduced overall thickness.
Solution Approach 2:
The patent places getter materials specifically at the interface between the polymer resin layer and the organic light emitting element, where moisture ingress is most critical. This localized placement of moisture-absorbing materials provides enhanced protection at the most vulnerable point while maintaining overall device thinness.
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 moisture degradation and enhances durability against external impacts, maintaining display quality and reducing thickness, while avoiding the use of glass substrates.
Implementation Method 1
a getter disposed between the organic light emitting element and the polymer resin layer. The getter includes a moisture absorbing material
Implementation Method 2
a binder having a volatilization degree of about 400 ppm or less when heated at a temperature ranging from about 60° C. to about 120° C. for about 2 hours
Data Source
AI summary
Disclosed is an organic light emitting diode device including a substrate, an organic light emitting element disposed on the substrate, a polymer resin layer covering the organic light emitting element, and a getter disposed between the organic light emitting element and the polymer resin. The getter may include a moisture absorbing material and a binder having a volatilization degree of about 400 ppm or less when heated at a temperature ranging from about 60° C. to about 120° C. for about 2 hours.