OLED Display Polymer Carpet Layer Impact Resistance
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Solution Overview
Problem
Organic light emitting diode (OLED) displays with thin film encapsulation layers are vulnerable to external impacts due to their weak mechanical strength, which can compromise the protection of the organic emission layer from moisture and oxygen.
Innovation Solution
A polymer carpet layer formed by a cross-linked biphenyl self-assembled mono-layer (SAM) and silicon (Si) is integrated between the thin film encapsulation layer and a cover film, enhancing the mechanical strength and impact resistance of the OLED display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a thin film encapsulation layer is used to reduce thickness, then the overall thickness of the OLED display is reduced, but the mechanical strength and impact resistance deteriorate
Solution Approach 1:
The patent introduces a polymer carpet layer composed of cross-linked polymer chains between the thin film encapsulation layer and the cover film. This polymer layer forms a composite structure that combines the thinness of the encapsulation layer with the mechanical strength of the polymer network, resolving the contradiction between reduced thickness and maintained mechanical strength.
Solution Approach 2:
The polymer carpet layer is strategically positioned only in specific regions where mechanical reinforcement is needed, rather than uniformly throughout the entire structure. This localized approach maintains the overall thin profile while providing targeted strength enhancement at critical stress points.
2Length of stationary object
If a thin film encapsulation layer is used to reduce thickness, then the overall thickness of the OLED display is reduced, but the impact resistance deteriorates
Solution Approach 1:
The cross-linked polymer carpet layer acts as a pre-formed cushioning structure that absorbs and dissipates impact energy before it reaches the fragile organic emission layer. The polymer network's inherent flexibility and energy absorption capabilities provide beforehand protection against external impacts while maintaining the thin overall structure.
3Reliability
If the organic emission layer is exposed to moisture and oxygen, then the quality of the OLED display deteriorates, but adding protective layers increases thickness
Solution Approach 1:
The patent creates a multi-layer composite encapsulation structure that integrates the thin film encapsulation layer, polymer carpet layer, and cover film. This composite approach provides effective moisture and oxygen barrier properties to protect the organic emission layer while minimizing the overall thickness increase through the use of thin functional layers.
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 polymer carpet layer with a tangled hair shape structure provides improved mechanical strength and impact resistance while maintaining a relatively thin thickness, effectively protecting the OLED display from external damage.
Implementation Method 1
irradiating ultraviolet (UV) to the cross-linked biphenyl self-assembled mono-layer in a state of contacting the thin film encapsulation layer to polymerize the cross-linked biphenyl self-assembled mono-layer and silicon included in the thin film encapsulation layer
Implementation Method 2
coating a monomer on a gold substrate and irradiating electrons to form a cross-linked biphenyl self-assembled mono-layer (SAM)
Data Source
AI summary
In one aspect, an organic light emitting diode (OLED) display that includes: a substrate; an organic light emitting element on the substrate; a thin film encapsulation layer on the substrate and covering the organic light emitting element; a polymer carpet layer directly on the thin film encapsulation layer; and a cover film directly on the polymer carpet layer is provided.