Dual Blocking Dam Structure for Flexible Display Moisture Protection
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Solution Overview
Problem
Flexible display devices, particularly those based on organic light-emitting technology, are vulnerable to external air and moisture permeation due to external impacts, which can compromise their performance and longevity.
Innovation Solution
The implementation of a dual blocking dam structure, comprising a first blocking dam with a gap and a second blocking dam that extends beyond the gap, surrounding the display area to prevent moisture and air ingress. The first blocking dam is made of organic or inorganic film structures, while the second blocking dam is positioned between the display area and the first blocking dam, with a design that ensures complete coverage of the gap, thereby enhancing the device's environmental tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single blocking dam is used to surround the display area, then the structure is simple and easy to manufacture, but it is vulnerable to external impacts that can cause air and moisture permeation
Solution Approach 1:
The blocking dam is divided into multiple separate dams (first blocking dam and second blocking dam) positioned at different locations. The first blocking dam has gaps between its portions, and the second blocking dam is positioned to correspond to these gaps, creating a segmented barrier system that prevents air and moisture permeation even when one segment is compromised
Solution Approach 2:
The patent implements a redundant blocking dam structure where the second blocking dam is positioned to cover the gaps of the first blocking dam. This provides a backup barrier that prevents air and moisture ingress even when the first blocking dam is damaged by external impacts, cushioning against potential failures
2Reliability
If the first blocking dam is made continuous without gaps, then it provides complete coverage, but it is more susceptible to damage from external impacts
Solution Approach 1:
The first blocking dam is intentionally segmented with gaps between its portions. This segmentation reduces stress concentration and susceptibility to catastrophic failure from external impacts, while the second blocking dam is positioned to correspond to these gaps to maintain protective coverage
Solution Approach 2:
The blocking dam structure has different configurations at different locations: the first blocking dam has gaps at specific positions, while the second blocking dam is positioned to correspond to these gaps. This local variation in structure optimizes both damage resistance and coverage
Data Source
AI summary
A display device includes a substrate including a display area and a non-display area surrounding the display area, a thin-film encapsulation layer disposed on the substrate, and a first blocking dam disposed outside the display area, the first blocking dam having at least one layer. Portions of the first blocking dam is removed, and thus, the divided pieces of the first blocking dam are spaced apart from each other, and a second blocking dam is disposed in at least one of a front portion and a rear portion of the first blocking dam corresponding to the spaced part.