Triple-Substrate Sealing for OLED Moisture Protection
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Solution Overview
Problem
Organic light emitting display devices are susceptible to moisture, requiring effective sealing structures to protect the organic emission layer, and existing desiccant layers either reduce the emission region or necessitate additional brackets.
Innovation Solution
A triple-substrate structure with desiccant layers between the substrates, where the second and third substrates are made of transparent and opaque materials respectively, efficiently intercepts moisture and provides impact resistance without reducing the emission region or requiring additional metal brackets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a desiccant layer is added to protect the organic emission layer from moisture, then moisture protection is improved, but the emission region is reduced
Solution Approach 1:
The patent embeds the desiccant layer within the sealing structure formed by the third substrate and seal, nesting the moisture protection function inside the existing sealing framework. This allows the desiccant to protect the emission layer without occupying space in the emission region, as it is positioned in the sealed cavity rather than over the emission area.
Solution Approach 2:
The patent transitions from a planar sealing structure to a three-dimensional sealed cavity by adding the third substrate. This vertical dimension allows the desiccant layer to be positioned within the cavity space, separating the moisture protection function from the emission plane and preserving the emission region area.
2Strength
If additional metal brackets are added to provide impact resistance, then structural strength is improved, but device complexity increases
Solution Approach 1:
The third substrate serves multiple functions simultaneously: it provides sealing (together with the seal), structural support (replacing metal brackets), and houses the desiccant layer for moisture protection. This multi-functionality eliminates the need for separate metal brackets, reducing device complexity while maintaining impact resistance.
Solution Approach 2:
The patent merges the sealing function, structural support function, and moisture protection function into a single integrated structure (the third substrate assembly). By combining these functions that were previously performed by separate components, the overall device complexity is reduced while maintaining all necessary functions.
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 triple-substrate structure effectively prevents moisture ingress, maintains a large emission region, and eliminates the need for additional metal brackets, enhancing the durability and performance of organic light emitting display devices.
Implementation Method 1
a use of a desiccant or hydroscopic layer having a good desiccative or hydroscopic ability is on the rise
Data Source
AI summary
Disclosed is an organic light emitting display, which includes a large quantity of a hydroscopic layer having a good hydroscopic ability by changing a mounting structure of the hydroscopic layer. An organic light emitting display includes a first substrate. An organic emission portion is formed at one surface of the first substrate. A second substrate is formed at a surface of the first substrate on which the organic emission portion is formed for sealing the organic emission portion from external air. A first hydroscopic layer is formed between the first and second substrates. A third substrate is formed at another surface of the first substrate for sealing the first substrate. A second hydroscopic layer is formed between the first and third substrates.