Thin Film Transistor Array Panel Step Difference Compensation
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Solution Overview
Problem
In thin film transistor array panels, step differences between conductive layers can lead to disconnection and increased resistance, disrupting the flow of signals and affecting the performance of liquid crystal displays.
Innovation Solution
A method is introduced where a contact hole is formed in the insulating layer to expose the step difference portion of the underlying wire, and an auxiliary electrode is deposited to fill this hole, ensuring electrical continuity and reducing resistance by connecting the overlapping and non-overlapping portions of the conductive layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple conductive layers are formed with step differences to create switching elements and signal lines, then the functionality of the thin film transistor array panel is improved, but disconnection occurs between layers and resistance increases
Solution Approach 1:
An auxiliary electrode is introduced as an intermediary element between the first and second conductive layers. This auxiliary electrode fills the contact hole that exposes the step difference portion of the underlying wire, providing a bridging connection that ensures electrical continuity between layers while accommodating the step difference geometry
Solution Approach 2:
The contact hole provides a vertical dimension for connection, allowing the auxiliary electrode to bridge the horizontal step difference between layers. By utilizing the vertical space within the contact hole, the invention creates a three-dimensional connection path that resolves the two-dimensional layer alignment issue
2Adaptability or versatility
If multiple conductive layers are formed with step differences to create switching elements and signal lines, then the functionality of the thin film transistor array panel is improved, but resistance increases
Solution Approach 1:
The auxiliary electrode merges with the existing conductive layers by filling the contact hole and simultaneously contacting both the first and second conductive layers. This merging creates a unified conductive path that reduces resistance by providing an additional parallel conduction path through the step difference region
3Ease of manufacture
If conventional layer formation methods are used without addressing step differences, then manufacturing is simpler, but disconnection occurs between overlying and underlying layers
Solution Approach 1:
The contact hole is formed in advance during the insulating layer formation process, exposing the step difference portion of the underlying wire before the overlying conductive layer is deposited. This preliminary action prepares the connection path in advance, ensuring that the auxiliary electrode can be properly positioned to bridge the step difference
Data Source
AI summary
The present invention relates to a thin film transistor array panel and a manufacturing method thereof, and a thin film transistor array panel according to an exemplary embodiment of the present invention includes: a substrate; a first conductive layer disposed on the substrate; a second conductive layer overlapping at least a portion of the edge of the first conductive layer on the first conductive layer and including a first portion overlapping the first conductive layer and a second portion not overlapping the first conductive layer; a first insulating layer disposed on the second conductive layer and having a contact hole exposing at least a portion of a boundary between the first portion and the second portion; and a third conductive layer disposed on the first insulating layer and simultaneously contacting the first portion and the second portion that are exposed through the contact hole.