Display Insulating Layer Crack Resistance
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Solution Overview
Problem
Display apparatuses, such as organic light-emitting display apparatuses, are prone to defects due to external impacts, which can lead to cracks in inorganic insulating layers and subsequent defects in multiple pixels.
Innovation Solution
The display apparatus incorporates a substrate with a first organic insulating layer, a conductive pattern, and a first inorganic insulating layer, all patterned to have the same shape, with a transparent conductive layer on top, and additional organic and inorganic insulating layers to reduce the likelihood of cracks and defects when external impacts occur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic insulating layers are used in display apparatus, then electrical insulation and device performance are improved, but the layers are prone to cracks under external impact
Solution Approach 1:
An organic insulating layer is introduced between the substrate and the inorganic insulating layer to act as a cushioning layer that absorbs external impact before it reaches the brittle inorganic insulating layer, preventing cracks from forming in the first place
Solution Approach 2:
The patent combines organic and inorganic materials in a multi-layer insulating structure, where the organic layer provides flexibility and impact resistance while the inorganic layer provides electrical insulation, creating a composite structure that leverages the advantages of both material types
2Reliability
If inorganic insulating layers are patterned to cover conductive patterns, then electrical insulation is improved, but cracks propagate to adjacent pixels causing multiple defects
Solution Approach 1:
The insulating structure is segmented into multiple layers (organic and inorganic) with distinct functions, where the organic layer acts as a barrier that stops crack propagation, isolating damage to the affected pixel area and preventing it from spreading to adjacent pixels
Solution Approach 2:
The organic insulating layer serves as a pre-positioned barrier that absorbs and dissipates impact energy before cracks can propagate through the inorganic insulating layer to adjacent pixels, effectively containing damage locally
3Strength
If multiple insulating layers are added to improve durability, then resistance to external impact is improved, but device complexity increases
Solution Approach 1:
The organic insulating layer is selectively positioned only where needed - between the substrate and the inorganic insulating layer in regions susceptible to external impact - providing enhanced durability precisely where required without unnecessarily complicating the entire device structure
Data Source
AI summary
For a display apparatus with excellent durability, the display apparatus includes a substrate, a first organic insulating layer disposed on the substrate, a first conductive pattern disposed on the first organic insulating layer, a first inorganic insulating layer interposed between the first organic insulating layer and the first conductive pattern and patterned to have a same shape as the first conductive pattern, and a first transparent conductive layer disposed on the first conductive pattern and patterned to have a same shape as the first conductive pattern.