Protrusion Pattern Alignment for Display Device Contact Holes
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Solution Overview
Problem
In the manufacturing of display devices, misalignment of photomasks during the exposure process can lead to unexpected etching of layers, resulting in short circuits or moisture and oxygen penetration, which affects the reliability and performance of LCD or OLED displays.
Innovation Solution
A pattern structure for display devices is developed, featuring a substrate with a protrusion pattern, a first conductive pattern covering the protrusion, an interlayer insulating layer with a contact hole, and a second conductive pattern connected through the contact hole, which overlaps the protrusion and first conductive pattern, reducing the risk of misalignment and enhancing electrical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photomask alignment is not precisely controlled during exposure process, then manufacturing complexity is reduced, but manufacturing precision deteriorates due to unexpected etching and layer misalignment
Solution Approach 1:
The protrusion pattern is formed in advance on the substrate before subsequent layer deposition. This preliminary structural feature serves as a reference that guides photomask alignment during exposure, ensuring precise positioning without requiring complex real-time alignment control systems.
Solution Approach 2:
The protrusion pattern acts as an intermediary reference element between the substrate and the photomask. By providing this intermediate physical reference, the system achieves precise alignment without needing complex alignment mechanisms, thus resolving the contradiction between precision and complexity.
2Ease of manufacture
If photomask misalignment occurs during exposure, then ease of manufacture is improved, but reliability deteriorates due to unexpected etching causing short circuits and moisture penetration
Solution Approach 1:
The protrusion pattern is pre-formed on the substrate to establish a reference framework before photomask exposure. This allows the exposure process to proceed with simpler alignment requirements while ensuring that subsequent etching and patterning steps remain precisely aligned, preventing short circuits and maintaining device reliability.
Solution Approach 2:
The protrusion pattern creates a physical barrier and reference structure that prevents harmful misalignment effects. By establishing this preliminary protective structure, the design preemptively counteracts potential alignment errors that would otherwise cause unexpected etching, short circuits, and moisture penetration.
3Reliability
If contact hole is positioned to overlap protrusion pattern and first conductive pattern, then electrical contact quality is improved, but manufacturing precision requirements increase
Solution Approach 1:
The protrusion pattern is formed in advance on the substrate before subsequent layer deposition. This preliminary structural feature serves as a reference that guides photomask alignment during exposure, ensuring precise positioning without requiring complex real-time alignment control systems.
Solution Approach 2:
The protrusion pattern acts as an intermediary reference element between the substrate and the photomask. By providing this intermediate physical reference, the system achieves precise alignment without needing complex alignment mechanisms, thus resolving the contradiction between precision and complexity.
Data Source
AI summary
A pattern structure for a display device includes a substrate, a protrusion pattern on the substrate, a first conductive pattern covering an upper surface of the protrusion pattern, an interlayer insulating layer on the first conductive pattern and including a contact hole, and a second conductive pattern on the interlayer insulating layer and connected to the first conductive pattern. The contact hole overlaps the protrusion pattern and the first conductive pattern.