Display Device Insulating Layer Deformation Prevention
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Solution Overview
Problem
Display devices face disconnection defects in the connecting members that link elements forming a driver, primarily due to deformation of insulating layers during the formation of contact holes, leading to disconnection issues.
Innovation Solution
A display device structure is developed with a substrate, signal lines, signal input lines, insulating layers, and an organic layer, where contact holes are defined in the insulating layers to connect signal lines and input lines using a connecting member made of transparent metal materials like ITO or IZO, reducing deformation and disconnection risks by using inorganic insulating materials like silicon oxide and silicon nitride.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact holes are formed in insulating layers to connect signal lines and input lines, then electrical connection is achieved, but deformation of insulating layers occurs causing disconnection defects
Solution Approach 1:
The patent uses a composite insulating layer structure combining organic and inorganic insulating materials. The inorganic insulating layer (e.g., silicon oxide, silicon nitride) provides dimensional stability and resistance to deformation during contact hole formation, while the organic insulating layer provides planarization and stress relief. This composite structure prevents disconnection defects while maintaining reliable electrical connections.
Solution Approach 2:
The patent forms the inorganic insulating layer before creating contact holes to prevent deformation. By establishing this stable, deformation-resistant layer in advance, the structure is prepared to withstand subsequent manufacturing processes without causing disconnection defects, thereby ensuring connection reliability from the outset.
2Stability of the object's composition
If additional insulating layers are added to prevent deformation, then structural stability improves, but device complexity increases
Solution Approach 1:
The inorganic insulating layer serves multiple functions simultaneously: it provides mechanical stability to prevent deformation, acts as an etch stop layer during contact hole formation, and maintains electrical insulation. This multi-functionality achieves structural stability without proportionally increasing device complexity, as a single layer performs multiple protective roles.
Solution Approach 2:
The patent modifies the material composition parameter of the insulating layer by introducing inorganic materials with specific physical properties (high mechanical strength, low deformation). This parameter change enhances structural stability without requiring complex multi-layer configurations, as the material property itself provides the necessary stability.
Data Source
AI summary
A display device includes: a substrate; a signal line on the substrate; a signal input line on the substrate and connected to a driver; a first insulating layer between the signal line and the signal input line; a second insulating layer on the signal line, the signal input line and the first insulating layer; an organic layer on the second insulating layer; a first contact hole defined in the organic layer, the first insulating layer and the second insulating layer and exposing the signal line; a second contact hole defined in the organic layer and the second insulating layer and exposing the signal input line; and a connecting member on the organic layer, and connecting the signal line and the signal input line to each other through the first contact hole and the second contact hole, respectively.