OLED Display Encapsulation with Anti-Oxidation Edge Layer
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Solution Overview
Problem
Organic light emitting diodes in display devices are vulnerable to oxygen and moisture permeation, leading to oxidation and degradation, resulting in dark spots and increased electric resistance, which degrades the display quality.
Innovation Solution
A display device design that includes an anti-oxidation layer covering the ends of the planarization and capping layers in the non-display area, along with a dam structure to seal the adhesive filler, which blocks oxygen permeation while maintaining a moisture barrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dam structure with spacer is used to seal the adhesive filler, then the moisture barrier characteristic is improved, but the encapsulation layer is pressed to crack and oxygen permeation occurs
Solution Approach 1:
The encapsulation structure is divided into multiple functional layers: the dam structure (including spacer and adhesive filler) provides moisture barrier function, while the anti-oxidation layer is added as a separate component specifically to prevent oxygen permeation. This segmentation allows each layer to optimize its specific function without compromising the other.
Solution Approach 2:
The solution employs composite material structure where the dam consists of multiple materials with different properties: the spacer material provides mechanical support and gap maintenance, the adhesive filler provides sealing and moisture barrier, and the anti-oxidation layer material specifically blocks oxygen. This composite approach resolves the contradiction by combining materials with complementary protective functions.
2Object-affected harmful factors
If oxygen absorbing filler is added to the dam, then oxygen permeation is reduced, but the moisture barrier characteristic is degraded due to reduced moisture absorbent ratio
Solution Approach 1:
The protective functions are segmented into separate components: the dam structure (with adhesive filler containing moisture absorbent) handles moisture barrier function, while the anti-oxidation layer (containing oxygen absorbing filler) handles oxygen barrier function. This segmentation eliminates the need to choose between moisture and oxygen protection in a single component.
Solution Approach 2:
The anti-oxidation layer acts as an intermediary barrier between the external environment and the organic light emitting diode. It specifically addresses oxygen permeation without interfering with the moisture barrier function of the underlying dam structure, allowing both protective functions to coexist effectively.
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 design effectively suppresses oxygen ingress, minimizing degradation and improving display reliability by preventing oxidation and voltage fluctuations, thus enhancing the display quality.
Implementation Method 1
an anti-oxidation layer covering an end of the planarization layer and an end of the capping layer in the non-display area
Implementation Method 2
a ratio of moisture absorbent is relatively reduced
Data Source
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AI summary
A display device includes a first substrate on which display and non-display areas are defined; a thin film transistor over the first substrate at a portion corresponding to the display area; a planarization layer over the substrate and the thin film transistor at a portion corresponding to the display area and at least a portion of the non-display area; an organic light emitting diode on the planarization layer at a portion corresponding to the display area; a capping layer at a portion corresponding to the display area and the at least a part of the non-display area to cover the planarization layer and the organic light emitting diode at a portion corresponding to the display area and the at least a part of the non-display area; and an anti-oxidation layer covering an end of the planarization layer and an end of the capping layer in the non-display area.