Co-Planar Touch Sensor Panel Layout for Single-Sided Fabrication
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Solution Overview
Problem
The high cost of manufacturing touch sensor panels with drive and sense lines on both sides of a substrate is due to the need for protective measures and flex circuit fabrication, making them expensive to produce.
Innovation Solution
A substantially transparent touch sensor panel with co-planar single-layer touch sensors fabricated on a single side of a substrate, where drive and sense lines are formed as column-like patterns and patches connected by metal traces in the border area, allowing a small flex circuit to be bonded to one side, eliminating the need for dual-sided processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If drive and sense lines are formed on both sides of the substrate, then touch sensitivity and functionality are improved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent combines both drive lines and sense lines on a single side of the substrate, eliminating the need for separate line formations on both sides. This merging approach maintains the mutual capacitance touch sensing functionality while reducing manufacturing steps, protective measures required, and overall production cost.
Solution Approach 2:
The patent uses a coplanar arrangement where drive and sense lines are positioned in the same plane on the substrate surface, separated by a dielectric material. This dimensional reorganization allows both line types to coexist on one side without interfering with each other, avoiding the need for dual-sided processing.
2Reliability
If drive and sense lines are formed on both sides of the substrate, then touch sensing capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the formation of drive lines and sense lines into a single-sided processing operation. By positioning both line types on the same substrate side with a dielectric separator, the patent eliminates the complexity of coordinating dual-sided processing steps and reducing the overall number of manufacturing operations required.
3Reliability
If flex circuit fabrication and bonding are performed on both sides, then electrical connectivity is improved, but manufacturing cost increases
Solution Approach 1:
The patent extracts the flex circuit bonding operation from a dual-sided process and consolidates it to a single side. By positioning all drive and sense line terminals on one substrate side, the patent eliminates the need for separate flex circuit fabrication and bonding operations on the opposite side, reducing material costs and manufacturing complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces manufacturing costs and complexity, enabling a more affordable and efficient production of touch sensor panels while maintaining touch sensitivity and versatility.
Implementation Method 1
a mutual-capacitance multi-touch sensor panel capable of being fabricated on a single side of a substrate
Data Source
Figure 1A
Figure 1B
Figure 1C~2A
AI summary
A touch sensor panel having co-planar single-layer touch sensors fabricated on a single side of a substrate is disclosed. The drive and sense lines can be fabricated as column-like patterns in a first orientation and patches in a second orientation, where each column-like pattern in the first orientation is connected to a separate metal trace in the border area of the touch sensor panel, and all patches in each of multiple rows in the second orientation are connected together using a separate metal trace in the border area of the touch sensor panel. The metal traces in the border areas can be formed on the same side of the substrate as the patches and columns, but separated from the patches and column-like patterns by a dielectric layer.