Touch Module Jumper Design for Nanowire Impedance and Clarity
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Solution Overview
Problem
Metal nanowires in touch electrodes for display devices face issues with contact impedance and reliability due to excessive gathering near jumpers, affecting visual clarity and circuit integrity.
Innovation Solution
A touch module design featuring a jumper structure with specific edge shapes and an oxide layer to prevent metal nanowire accumulation, combined with an isolation layer and grid patterns, ensures low contact impedance and optical visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact area between the jumper and the touch electrode is increased by increasing the volume of the ends of the jumper, then the contact impedance is reduced, but the visual clarity of the touch display device is degraded
Solution Approach 1:
The jumper is divided into multiple segments including a first jumper body, a second jumper body, and multiple jumper ends. This segmentation allows different parts of the jumper to serve different functions: the jumper ends provide contact area for low impedance while the jumper bodies maintain visual clarity by being thinner and transparent.
Solution Approach 2:
Different parts of the jumper have different structural characteristics optimized for their specific functions. The jumper ends have larger volume for electrical contact, while the jumper bodies have smaller volume for visual clarity. This local differentiation resolves the contradiction between contact impedance and visual clarity.
2Adaptability or versatility
If metal nanowires are used to make the touch electrode, then the flexibility and transparency are improved, but the reliability is degraded due to metal nanowire accumulation and gathering near the jumper
Solution Approach 1:
An isolation layer is introduced as an intermediary between the metal nanowire touch electrode and the jumper. This isolation layer prevents direct contact between metal nanowires and the jumper, thereby preventing nanowire accumulation and gathering that would cause short or open circuits, while still allowing electrical connection to be maintained.
3Illumination intensity
If the metal nanowires are distributed in the touch electrode in a form of filaments, then the transparency and flexibility are improved, but the contact impedance cannot meet specification requirements
Solution Approach 1:
The jumper is segmented into multiple jumper ends that can be distributedly arranged to contact different regions of the metal nanowire touch electrode. This segmentation increases the effective contact area without requiring a single large-volume contact point, thereby reducing contact impedance while maintaining the transparency benefits of metal nanowire filaments.
Data Source
AI summary
A touch module includes a substrate, a first horizontal touch electrode, a second horizontal touch electrode, a first jumper, and a first vertical touch electrode. The first horizontal touch electrode and the second horizontal touch electrode are disposed on the substrate at intervals along a first direction. The first jumper is connected to the first horizontal touch electrode and the second horizontal touch electrode, and has a first main portion and at least two first extending portions, in which the first main portion is between the two first extending portions in the first direction. The two first extending portions are respectively disposed corresponding to the first horizontal touch electrode and the second horizontal touch electrode. The first vertical touch electrode is disposed on the substrate, located between the first horizontal touch electrode and the second horizontal touch electrode in the first direction, and is electrically insulated from the first jumper.