Sealing Layer Oxygen Permeability for Display Moisture Management
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Solution Overview
Problem
In display units with multilayered wiring boards, moisture ingress from the substrate's end face and back surface is not adequately prevented by surface-inorganic barrier layers, leading to voids and reduced manufacturing yield due to weak adhesion and trapped moisture/gas, causing film peeling and ionic migration.
Innovation Solution
A sealing layer with a resin material having an oxygen transmission rate higher than the water-vapor transmission rate is applied on the insulating layer covering the wiring lines and light-emission sections, allowing moderate release of substrate moisture and generated gases, thereby reducing film peeling and moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inorganic barrier layer is provided on the substrate to suppress moisture ingress, then moisture resistance is improved, but adhesion strength deteriorates due to weak bonding between the inorganic barrier layer and organic substrate
Solution Approach 1:
The patent employs a composite sealing layer structure comprising an organic resin layer and an inorganic barrier layer. The organic resin layer (first sealing layer) provides strong adhesion to the organic substrate, while the inorganic barrier layer (second sealing layer) provides moisture resistance. This composite structure resolves the contradiction by combining materials with complementary properties, allowing both good adhesion and moisture barrier performance.
2Reliability
If a moisture barrier layer is added to prevent ionic migration, then reliability is improved, but device complexity increases
Solution Approach 1:
The sealing layer in the patent serves multiple functions simultaneously: it provides adhesion to the substrate, acts as a moisture barrier to prevent ionic migration, and provides mechanical protection. By combining multiple functions into a single integrated sealing layer structure, the patent achieves improved reliability without proportionally increasing device complexity.
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
This configuration effectively reduces film peeling and void formation while maintaining high ionic migration tolerance at a lower cost by diffusing moisture and gases outside, enhancing the display unit's reliability and yield.
Implementation Method 1
a sealing layer provided on an entire surface of the insulating layer, and including a resin material having an oxygen transmission rate higher than a water-vapor transmission rate
Data Source
AI summary
A display unit according to an embodiment of the disclosure includes a substrate, a wiring line and a light-emission section that are provided on the substrate, an insulating layer covering the wiring line and the light-emission section, and provided on an entire surface of the substrate, and a sealing layer provided on an entire surface of the insulating layer, and including a resin material having an oxygen transmission rate higher than a water-vapor transmission rate.