Touch Panel Metal Line Structure for Bendable Region Crack Resistance
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Solution Overview
Problem
Existing touch panels with all double-layer metal lines in both bendable and non-bendable regions suffer from uneven film layer thickness, leading to cracks when bent, due to the large thickness of double-layer metal lines.
Innovation Solution
A touch panel design where the bendable region has single-layer metal lines and the non-bendable region has double-layer metal lines, with the double-layer metal lines in the non-bendable region connected in parallel to increase sectional area and reduce impedance, while the single-layer metal lines in the bendable region prevent film layer cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If double-layer metal lines are used in both bendable and non-bendable regions, then impedance is reduced and conductivity is improved, but film layer thickness becomes uneven and cracks occur during bending
Solution Approach 1:
The patent applies different metal line structures to different regions: single-layer metal lines in the bendable region and double-layer metal lines in the non-bendable region. This local differentiation allows the bendable region to maintain flexibility and crack resistance, while the non-bendable region achieves lower impedance and better conductivity through the double-layer structure.
2Strength
If single-layer metal lines are used in the bendable region, then film layer cracking is prevented, but impedance increases and conductivity decreases
Solution Approach 1:
The patent uses single-layer metal lines specifically in the bendable region to maintain flexibility and prevent cracking, while using double-layer metal lines in the non-bendable region to reduce impedance and improve signal transmission. This spatial differentiation of metal line structures resolves the contradiction between flexibility and signal transmission quality.
3Reliability
If double-layer metal lines are used in the non-bendable region, then impedance is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent implements double-layer metal lines only in the non-bendable region where impedance control is critical, while using simpler single-layer metal lines in the bendable region. This localized approach to complex structure reduces overall manufacturing complexity compared to using double-layer structures throughout the entire display panel.
Data Source
AI summary
A touch panel includes a carrier panel, a plurality of touch electrodes and a plurality of touch lines. The carrier panel has a bendable region and a non-bendable region. The plurality of touch electrodes and the plurality of touch lines are disposed on the carrier panel, and a touch electrode of the plurality of touch electrodes is electrically connected to one or more touch lines. A portion of at least one touch line located in the bendable region is a single-layer metal line, and at least a part of a portion of the at least one touch line located in the non-bendable region is a double-layer metal line.