Capacitive Sensing Electrodes with Segmented Conductive Patterns
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Solution Overview
Problem
Current display devices with touch input functionality face challenges in achieving uniform touch sensitivity due to interference from conductive patterns and variations in capacitance caused by the distance between sensing electrodes and touch sensors.
Innovation Solution
The implementation of a capacitive sensing unit with a conductive layer having spaced-apart conductive patterns on capacitive sensing electrodes, which includes a mesh-shaped conductive fine line structure and an insulating layer, to enhance touch sensitivity and reduce capacitance interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive patterns are placed on sensing electrodes to improve electrical connection, then electrical conductivity is improved, but capacitance interference increases and touch sensitivity becomes non-uniform
Solution Approach 1:
The conductive layer is divided into multiple spaced-apart conductive patterns instead of being continuous. This segmentation reduces the overall capacitance interference while maintaining electrical connectivity across the sensing electrode, thereby improving touch sensitivity uniformity without sacrificing electrical conductivity.
Solution Approach 2:
The conductive patterns are strategically positioned only in regions where electrical connection is needed, rather than covering the entire sensing electrode. This localized approach maintains necessary conductivity while minimizing capacitance interference in the touch sensing regions, achieving uniform touch sensitivity.
2Reliability
If continuous conductive layer is used on sensing electrodes, then electrical connection is improved, but capacitance interference increases
Solution Approach 1:
The continuous conductive layer is segmented into discrete spaced-apart conductive patterns. This reduces the total conductive material present on the sensing electrode, thereby reducing capacitance interference while maintaining sufficient electrical connection through the distributed pattern arrangement.
Solution Approach 2:
Excess conductive material is removed from the continuous layer, keeping only the necessary conductive patterns for electrical connection. This extraction of unnecessary conductive material reduces capacitance interference while preserving essential electrical connectivity.
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 configuration improves touch sensitivity by maintaining consistent capacitance readings across the display surface, allowing for precise touch detection and reduced visibility of the conductive patterns, thus enhancing user interaction with the display device.
Implementation Method 1
the input sensing unit includes a plurality of capacitive sensing electrodes
Implementation Method 2
the conductive layer includes a plurality of conductive patterns spaced apart from each other
Data Source
AI summary
An input sensing unit including a plurality of capacitive sensing electrodes, and a conductive layer disposed on at least a portion of the sensing electrodes, in which the conductive layer overlaps at least a portion of the sensing electrodes in a plan view, and the conductive layer includes a plurality of conductive patterns spaced apart from each other.