Foamed Polymer Layer Impact Resistance OLED Substrate
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Solution Overview
Problem
OLED display devices using thin glass or plastic substrates are vulnerable to external impacts, which can damage the light-emitting diode and driving thin film transistor, compromising the reliability of the device.
Innovation Solution
A foamed polymer layer with a polymer resin and air pockets is disposed on the outer surface of the substrate, providing enhanced impact resistance by absorbing and alleviating external impacts, while maintaining transparency and minimal effect on brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If thin glass or plastic substrate is used to achieve light weight and thin profile, then weight and thickness are reduced, but impact resistance deteriorates
Solution Approach 1:
The patent applies composite materials by combining the thin glass or plastic substrate with a foamed polymer layer to create a hybrid structure. The substrate provides light weight and thin profile, while the foamed polymer layer provides impact resistance, thus resolving the contradiction between weight reduction and impact resistance maintenance.
Solution Approach 2:
The patent uses a foamed polymer layer as a flexible protective shell on the outer surface of the substrate. This thin film structure provides impact resistance without significantly increasing weight or thickness, allowing the device to maintain its light and thin characteristics while improving durability.
2Reliability
If foamed polymer layer is added to improve impact resistance, then durability is improved, but device complexity increases
Solution Approach 1:
The patent segments the protective function by adding a separate foamed polymer layer distinct from the substrate. This segmentation allows the impact resistance function to be provided by a specialized material without complicating the substrate manufacturing process, as the foamed polymer layer can be applied as a separate coating or laminate.
Solution Approach 2:
The foamed polymer layer acts as an intermediary between the external impact and the fragile substrate. It absorbs and dissipates impact energy before it reaches the substrate, protecting the internal components without requiring complex structural modifications to the substrate itself.
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 foamed polymer layer effectively prevents cracks and maintains display performance under impact, even when bent, improving the overall impact resistance and durability of the OLED display device without reducing brightness or contrast.
Implementation Method 1
a foamed polymer layer disposed on a second side of the substrate and including a polymer resin and an air pocket inside the polymer resin
Data Source
AI summary
An organic light-emitting diode (OLED) display device includes a substrate; a light-emitting diode including a first electrode, an organic emitting layer and a second electrode and disposed on a first side of the substrate; and a foamed polymer layer disposed on a second side of the substrate and including a polymer resin and an air pocket inside the polymer resin.