TFT Display Conductive Structure for Feedthrough Voltage Control
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Solution Overview
Problem
Conventional display devices face challenges in achieving high display quality due to limitations in the thin film transistor structure, particularly in terms of switch performance and optical properties, which affect the overall efficiency and image quality.
Innovation Solution
A substrate assembly with a specific design featuring a conductive structure adjacent to a conductive line, where the conductive structure has an overlapping region with a curved shape, optimizing the area and length to balance resistance and parasitic capacitance for improved current flow and reduced feedthrough voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conductive structure has a larger overlapping region with the gate structure, then the current flow is improved, but the parasitic capacitance increases causing feedthrough voltage
Solution Approach 1:
The conductive structure features a curved end portion instead of a straight edge, creating a gradual transition zone that reduces the overlapping area with the gate structure. This curvature design minimizes parasitic capacitance formation while preserving adequate current flow paths through the conductive structure.
Solution Approach 2:
The conductive structure employs different geometric characteristics in different regions: the curved end portion specifically addresses the overlapping region to reduce parasitic capacitance, while other portions maintain appropriate dimensions for current conduction. This localized geometric optimization resolves the contradiction between current flow and parasitic capacitance.
2Area of stationary object
If the conductive structure is positioned closer to the conductive line, then the area is reduced, but the resistance increases
Solution Approach 1:
The curved end portion of the conductive structure extends the effective area without requiring additional linear space. The curvature allows the conductive structure to maintain adequate distance from the conductive line while preserving sufficient cross-sectional area for current conduction, thus reducing resistance without increasing overall footprint.
Solution Approach 2:
Instead of increasing area by expanding in linear dimensions, the curved end portion utilizes geometric curvature to effectively increase the conductive path area. This dimensional approach allows area optimization without proportionally increasing the distance from adjacent conductive lines.
Data Source
AI summary
A substrate assembly includes: a substrate; a gate structure disposed on the substrate; a conductive line disposed on the substrate, wherein from a top view, the conductive line extends along a first direction; and a conductive structure disposed on the substrate, wherein from the top view, the conductive structure is adjacent to the conductive line and separated from the conductive line, and the conductive structure has an overlapping region overlapping the gate structure, wherein from the top view, the overlapping region extends along a second direction, the first direction and the second direction are different, the overlapping region comprises a first end portion, and the first end portion has a curved shape.