Mesh Touch Electrodes for RC Delay Reduction
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Solution Overview
Problem
In self-capacitance touch sensing methods using two layers, the increasing overlapping area between touch electrodes and sensing lines leads to resistance-capacitance (RC) delay issues as display devices grow in size, affecting touch sensing performance.
Innovation Solution
A touch sensing unit is designed with touch electrodes having a mesh shape, where the bodies of the electrodes do not overlap the sensing lines in the thickness direction except for partial areas, utilizing a base substrate, touch sensing lines, and insulating layers to minimize coupling capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch electrodes and sensing lines are disposed to overlap each other in a thickness direction to increase touch electrode area, then touch sensing performance is improved, but coupling capacitance increases leading to RC delay problems
Solution Approach 1:
The touch electrode is divided into a mesh pattern with multiple segments separated by mesh holes, reducing the continuous overlapping area with sensing lines while maintaining overall electrode functionality and touch sensing performance
Solution Approach 2:
The mesh structure creates local variations in electrode presence, with mesh holes providing regions of reduced coupling capacitance while body portions maintain necessary capacitive coupling, achieving spatially differentiated electrical characteristics
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 reduces coupling capacitance and minimizes RC delay, enhancing touch sensing performance and reliability in larger display devices.
Implementation Method 1
A touch sensor may be driven in, for instance, a mutual capacitance method or a self-capacitance method... the touch electrode and the sensing line may be disposed to overlap each other in a thickness direction... a resistance-capacitance (RC) delay problem may occur
Data Source
AI summary
A touch sensing unit includes a base substrate, touch sensing lines disposed on the base substrate, a first touch insulating layer disposed on the touch sensing lines, and touch electrodes disposed on the first touch insulating layer. The touch electrodes overlap the touch sensing lines in a thickness direction. Each of the touch electrodes has a mesh shape including a body and mesh holes. The bodies do not overlap the touch sensing lines in the thickness direction in a remaining area, except for partial areas.