Stretchable OLED Encapsulation Side Wall Protrusion
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Solution Overview
Problem
During the manufacturing process of stretchable organic light emitting display devices, the thin film encapsulation layer is often excessively torn off when peeling the substrate from the glass substrate, leading to a shortened water and moisture blocking path at the side wall, which can cause infiltration and defects in the device.
Innovation Solution
The organic light emitting display device incorporates an organic pattern on the side wall of the substrate adjacent to the through-opening, with a thin film encapsulation structure comprising a first and second inorganic thin film encapsulation layer, and an organic thin film encapsulation layer, where the organic pattern contacts the inorganic layers, and the second inorganic layer extends to cover the side wall, preventing moisture infiltration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the substrate is peeled from the glass substrate during manufacturing, then the stretchable substrate can be formed for display on curved surfaces, but the thin film encapsulation layer is excessively torn off on the side wall, shortening the moisture blocking path
Solution Approach 1:
The patent forms a protrusion on the glass substrate at the outermost peripheral portion before peeling the substrate. This protrusion serves as a support structure that prevents the thin film encapsulation layer from being torn off during the peeling process, thereby maintaining the integrity of the moisture blocking path while enabling substrate stretchability
Solution Approach 2:
The protrusion acts as an intermediary structure between the glass substrate and the thin film encapsulation layer. It provides mechanical support to the encapsulation layer during the peeling process, preventing direct stress concentration that would cause tearing, thus protecting the moisture blocking integrity while allowing substrate formation
2Ease of manufacture
If the thin film encapsulation layer is torn off on the side wall, then peeling is easier, but the path for blocking permeation of water and moisture is shortened, causing infiltration
Solution Approach 1:
The protrusion is formed on the glass substrate before the peeling process begins. This preliminary structure provides continuous support to the thin film encapsulation layer during peeling, preventing tear-off while maintaining the moisture blocking path integrity, thus achieving both easy peeling and protection against infiltration
3Reliability
If the second inorganic thin film encapsulation layer is made thicker to prevent tearing, then moisture blocking is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the support function from the encapsulation function by introducing a separate protrusion structure on the glass substrate. This allows the thin film encapsulation layers to maintain their original thickness without needing to be made thicker for structural support, thereby maintaining moisture blocking strength while avoiding increased manufacturing complexity
Solution Approach 2:
The protrusion serves as an intermediary support structure that eliminates the need to increase encapsulation layer thickness for mechanical strength. This separate support mechanism maintains the simplicity of the encapsulation layer structure while ensuring reliable moisture blocking
Data Source
AI summary
An organic light emitting display device includes: a substrate including: pixel regions; connection regions between adjacent pixel regions from among the pixel regions, respectively; and a region having a through-opening, the region being defined by the adjacent pixel regions, and the connection regions respectively between the adjacent pixel regions; a sub-pixel structure on the substrate at each of the pixel regions; and an organic pattern on a side wall of the substrate, the side wall being adjacent to the through-opening.