Flat Panel Display Interconnecting Lines Insulation
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Solution Overview
Problem
Conventional flat panel display apparatuses are prone to short circuits between interconnecting lines due to a single insulating layer, which can be compromised by external pressure from the sealing substrate, leading to defects and malfunction.
Innovation Solution
Incorporating at least two insulating layers, including an inorganic material, between the first and second interconnecting lines, along with a protection film and an inter-insulating film, to prevent short circuits and enhance structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only a single insulating layer is disposed between the first and second interconnecting lines, then the device complexity is reduced and manufacturing is simplified, but short circuits may occur between the interconnecting lines due to insulating layer defects or external pressure from the sealing substrate
Solution Approach 1:
The single insulating layer is segmented into multiple insulating layers (first insulating layer, second insulating layer, and inter-insulating film) positioned between the first and second interconnecting lines. This segmentation provides redundant insulation paths, so that if one layer becomes defective or compressed, other layers maintain electrical insulation, thereby resolving the reliability issue without excessive complexity.
Solution Approach 2:
The insulating structure uses composite materials with different properties - the first and second insulating layers are formed of organic materials while the inter-insulating film is formed of inorganic materials. This composite approach combines the advantages of different materials to provide both flexibility and mechanical strength, preventing short circuits under external pressure while maintaining manufacturability.
2Reliability
If the sealing substrate is coupled to the substrate along its edges by way of a sealant, then the display unit is sealed and protected, but the first interconnecting line may be pressed towards the second interconnecting line, causing a short circuit
Solution Approach 1:
The multiple insulating layers are positioned beforehand between the first and second interconnecting lines to cushion against external pressure from the sealant. This prior cushioning prevents the harmful effect of pressure-induced short circuits while maintaining the necessary sealing protection, as the insulating layers absorb and distribute the mechanical stress.
Solution Approach 2:
The inter-insulating film formed of inorganic material acts as an intermediary layer between the organic insulating layers, providing mechanical support and resistance to external pressure. This intermediary structure mediates between the sealing substrate's coupling force and the interconnecting lines, preventing direct contact that would cause short circuits.
3Reliability
If at least two insulating layers including inorganic material are used between interconnecting lines, then short circuits are minimized and reliability is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The manufacturing process parameters are optimized to form the multiple insulating layers efficiently - the first and second insulating layers are formed of organic materials that can be deposited using standard organic thin film deposition techniques, while the inter-insulating film is formed of inorganic materials using inorganic thin film deposition. This parameter optimization maintains ease of manufacture while achieving the reliability benefits of multiple layers.
Data Source
Figure 1~2
Figure 3
Figure 4A
AI summary
A flat panel display apparatus, including a substrate, a display unit disposed on the substrate, a first interconnecting line positioned on the substrate at an outer side of the display unit, a second interconnecting line located above the first interconnecting line, and at least two insulating layers interposed between the first and second interconnecting lines.