Touch Sensor Electrode Segmentation for Stylus and Hover Detection
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Solution Overview
Problem
Existing touch sensors experience issues with signal loss or divergence when touched at multiple points, leading to reduced touch sensing sensitivity and accuracy, particularly when using a stylus pen or in hovering touch scenarios.
Innovation Solution
The touch sensor design includes a driving electrode with patterned parts connected by a connection pattern, and a receiving electrode with alternating symmetrical pattern parts, which are electrically connected in specific groups to enhance capacitance variation and reduce dummy capacitance, allowing for improved signal detection and stylus pen sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional touch sensor with single-layer or double-layer electrodes is used, then the device structure is simple, but signal loss or divergence occurs when touched at multiple points, reducing touch sensing sensitivity
Solution Approach 1:
The receiving electrode is segmented into multiple receiving pattern parts (first receiving pattern parts and second receiving pattern parts) that are alternatively arranged. This segmentation allows the sensor to distinguish between different touch points more effectively, preventing signal divergence while maintaining structural manageability.
Solution Approach 2:
Different regions of the receiving electrode have different properties - the first receiving pattern parts and second receiving pattern parts are configured with specific geometric characteristics (such as triangular shapes with different orientations) that optimize their respective responses to touch inputs at different locations, thereby improving overall sensing precision.
2Measurement precision
If the receiving electrode uses a simple continuous pattern, then the manufacturing process is easy, but dummy capacitance variation increases, reducing signal detection accuracy
Solution Approach 1:
The receiving electrode is divided into discrete pattern parts (first receiving pattern parts and second receiving pattern parts) with specific geometric shapes. This segmentation reduces dummy capacitance by minimizing parasitic capacitance between adjacent electrode regions, thereby improving signal detection accuracy while maintaining manufacturability through standard photolithography processes.
Solution Approach 2:
The first receiving pattern parts and second receiving pattern parts have asymmetric geometric configurations (such as triangular shapes with different orientations). This asymmetry helps differentiate between active capacitance signals and dummy capacitance signals, improving signal detection accuracy without complicating the manufacturing process.
3Measurement precision
If the touch sensor uses conventional electrode arrangement, then the device is compact, but hovering touch and stylus pen sensing accuracy is reduced
Solution Approach 1:
The receiving electrode is segmented into multiple alternatively arranged pattern parts that increase the effective sensing area without proportionally increasing the overall device area. This segmentation enables more precise detection of hovering touches and stylus pen inputs by providing multiple discrete sensing zones within a compact footprint.
Solution Approach 2:
The alternatively arranged first and second receiving pattern parts create a two-dimensional sensing matrix that maximizes sensing coverage within a compact area. This dimensional arrangement improves hovering touch and stylus pen sensing accuracy by providing spatial resolution in multiple directions without significantly increasing the overall sensor area.
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 design enhances touch sensing sensitivity, reduces signal divergence, and enables accurate detection of hovering touches and stylus pen inputs by increasing active capacitance variation and minimizing dummy capacitance variations.
Implementation Method 1
a phenomenon, in which a signal that has to be normally sensed disappears, or a signal that has to be sensed is diverged as being touched at two or more points appears
Implementation Method 2
when a driving signal is applied to a driving electrode
Data Source
AI summary
Provided are a touch sensor and a touch input device including the same. The touch sensor includes a driving electrode including a plurality of driving pattern parts arranged in a first direction and a connection pattern configured to electrically connect two driving pattern parts, which are adjacent to each other, of the plurality of driving patterns to each other, and a receiving electrode, in which a first receiving pattern part and a second receiving pattern part, which are disposed with the connection pattern of the driving electrode therebetween, are alternatively arranged in a second direction perpendicular to the first direction.