Co-Planar Single-Layer Touch Sensor Panel for Lower-Cost Displays
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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 on both sides, making them expensive to produce.
Innovation Solution
The solution involves fabricating drive and sense lines on a co-planar single layer on one side of the substrate, with column-like patterns and patches connected by metal traces in the border area, allowing a small flex circuit to be bonded to one side, reducing manufacturing complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If drive and sense lines are formed on both sides of the substrate, then touch sensitivity and accuracy are improved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent transitions from a dual-sided three-dimensional structure to a single-sided planar structure by arranging drive lines and sense lines in different orientations (first orientation and second orientation) on the same side of the substrate, eliminating the need for backside processing while maintaining touch detection capability
Solution Approach 2:
The touch sensor panel is segmented into column-like patterns in a first orientation and patches in a second orientation, with metal traces routed to different edges of the substrate. This segmentation allows independent processing and routing of drive and sense lines on a single side, reducing manufacturing complexity while preserving multi-touch detection functionality
2Adaptability or versatility
If drive and sense lines are formed on both sides of the substrate, then touch detection functionality is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the drive lines and sense lines onto a single side of the substrate, combining what were previously separate layers on opposite sides into one integrated planar structure. This merging eliminates the need for protective measures on the backside and reduces flex circuit fabrication costs while maintaining full touch detection functionality
Solution Approach 2:
The single-sided structure serves multiple functions: it provides touch detection capability, eliminates the need for backside protective measures, and reduces flex circuit requirements. By making the structure universal for both drive and sense functions on one side, the patent reduces overall manufacturing cost while maintaining versatility
3Reliability
If protective measures are implemented on both sides of the substrate, then manufacturing reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the need for protective measures from the backside of the substrate by relocating all functional elements to the front side. Since all drive and sense lines are formed on a single side, there is no exposed processed surface on the backside that requires protection, thereby eliminating a source of 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 results in a cost-effective, transparent touch sensor panel capable of detecting single or multi-touch events with improved manufacturing efficiency and reduced production costs, while maintaining touch sensitivity and accuracy.
Implementation Method 1
a mutual-capacitance multi-touch sensor panel capable of being fabricated on a single side of a substrate
Data Source
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.