OELD Moisture Sealing via Protrusion-Groove Nesting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing organic electroluminescent display devices face issues with moisture penetration due to non-uniform seal patterns, which can lead to separation of substrates and contact looseness, and the current sealing methods are inadequate in preventing oxygen and moisture exposure to the organic luminescent layer.
Innovation Solution
The solution involves forming a protrusion on one substrate and a corresponding groove on the other, with a seal pattern formed between them, ensuring a secure and moisture-resistant seal by creating a space and using a viscous sealant to form a reverse 'U' shaped seal pattern, preventing moisture ingress and avoiding coverage of critical lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seal pattern is formed at edges of substrates to seal the OELD device, then the substrates are sealed, but moisture can still penetrate through the interface between the seal pattern and substrates
Solution Approach 1:
The invention transitions from a two-dimensional seal pattern on the substrate surface to a three-dimensional protrusion structure that extends vertically from the first substrate. This dimensional change creates multiple sealing interfaces and prevents moisture penetration paths that existed in the planar seal configuration.
Solution Approach 2:
The protrusion structure is inserted into a groove formed on the second substrate, creating a nested configuration where the first substrate's protrusion fits within the second substrate's groove. This nesting creates an interlocking seal that prevents moisture ingress at the substrate interface.
2Reliability
If the seal pattern is made thicker to improve sealing, then sealing is enhanced, but the seal pattern may cover gate lines and data lines causing contact looseness
Solution Approach 1:
The protrusion is formed with specific dimensional characteristics (thickness and width) that are optimized for sealing performance while being localized to the edge regions of the substrate. This localized three-dimensional structure provides enhanced sealing at the boundaries without extending over the active display regions where gate and data lines are located, thus avoiding contact looseness issues.
3Object-generated harmful factors
If the seal pattern is made thinner to avoid covering lines, then contact looseness is avoided, but moisture can penetrate through thin portions of the seal
Solution Approach 1:
By transitioning from a thin two-dimensional seal pattern to a three-dimensional protrusion structure with optimized thickness and width, the invention achieves effective moisture blocking without requiring the seal to extend over the active display regions. The vertical dimension of the protrusion provides the necessary barrier height to prevent moisture penetration while maintaining clear separation from the gate and data lines.
Data Source
AI summary
An organic electroluminescent display (OELD) device includes first and second substrates facing each other and having a display region and a non-display region on a periphery of the display region, an organic electroluminescent diode in the display region of the first substrate, a protrusion formed with a first thickness and a first width in the non-display region of the first substrate, a groove formed with a first depth and a second width in the non-display region of the second substrate, wherein the protrusion is inserted into the groove, a seal pattern formed between the protrusion and the groove.