OLED Display Sealing Frame with Reinforced Edges
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Solution Overview
Problem
Conventional organic light emitting diode displays face deformation issues due to stress concentration at the cell seal structure, particularly in areas with non-uniform steps or edges, leading to potential rupturing of the sealing portion.
Innovation Solution
The design incorporates a sealing portion with varying widths, where the first sealing frame portion adjacent to a pad portion has a wider width than others, and includes reinforced triangular-shaped sealing materials at edges to disperse stress, preventing cell seal structure deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a uniform sealing frame structure is used around the display substrate, then the manufacturing process is simple, but stress concentration occurs at edges and corners leading to deformation and rupturing
Solution Approach 1:
The sealing frame is designed with different widths at different locations: wider at edges and corners where stress concentration occurs, and narrower in the middle sections. This local variation in geometry provides enhanced strength and stress distribution precisely where needed, rather than uniformly increasing the entire sealing frame width.
Solution Approach 2:
The sealing frame employs asymmetric geometry with protruding portions at specific locations (edges and corners) rather than a symmetric uniform structure. This asymmetric design allows the sealing frame to better accommodate and distribute stresses that naturally concentrate at these critical locations.
2Stability of the object's composition
If the sealing frame width is increased throughout to prevent deformation, then stress distribution improves, but the display area and overall device size increase
Solution Approach 1:
Instead of uniformly increasing the sealing frame width across the entire perimeter, the design applies wider sections only at critical stress points (edges and corners) while maintaining narrower widths in less critical areas. This localized reinforcement provides the necessary structural stability without unnecessarily expanding the overall display area.
Solution Approach 2:
The sealing frame applies reinforcement (wider sections) partially only where it is most needed for stress distribution, rather than excessively reinforcing the entire structure. This partial action achieves adequate stability while minimizing area occupation.
3Area of stationary object
If the sealing frame has narrow width to maximize display area, then device size is minimized, but stress concentration leads to releasing and rupturing of the cell seal structure
Solution Approach 1:
The sealing frame incorporates wider sections at specific critical locations (edges and corners) where stress concentration occurs, while maintaining narrower widths in intermediate sections. This local quality variation ensures reliability at stress-critical points without unnecessarily reducing the overall display area.
Solution Approach 2:
The sealing frame is segmented into different width sections rather than being a uniform continuous structure. This segmentation allows optimization of each section's width based on its specific functional requirements - wider at stress points for reliability, narrower elsewhere for maximizing display area.
Data Source
AI summary
An organic light emitting diode display includes a display substrate including an organic light emitting element and a driving circuit part, an encapsulation substrate sealing the display substrate, and a sealing portion between the display substrate and the encapsulation substrate, the sealing portion including a plurality of sealing frame portions around the display substrate, and a first sealing frame portion of the plurality of sealing frame portions being adjacent to a pad portion, wherein at least one of a width of an edge of the sealing portion and a width of the first sealing frame portion is wider than a width of a sealing frame portion other than the first sealing frame portion.