Branch Touch Electrode Layout for Edge Capacitance Linearity

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Solution Overview

Problem

Existing touch electrode structures in touch panels exhibit poor touch performance, particularly in edge regions due to low mutual capacitance and poor touch linearity, leading to inaccurate detection of touch positions.

Innovation Solution

A touch electrode structure with branch electrodes arranged in intersecting directions, featuring gaps between branch electrodes of adjacent touch electrodes to enhance mutual capacitance and improve touch linearity, ensuring insulation and effective signal transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional touch electrode structures are used, then manufacturing is simpler, but touch performance is poor with low mutual capacitance and poor touch linearity

Engineering Contradiction:

Improvetouch performanceVSAvoidelectrode structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The touch electrode structure is segmented into multiple components: first touch electrodes with first branch electrodes, second touch electrodes with second branch electrodes, first connection electrodes, and second connection electrodes. This segmentation allows each component to serve specific functions, improving mutual capacitance and touch linearity while maintaining manageable complexity through modular design

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces branch electrodes extending in directions intersecting with the main body electrode arrangement. This dimensional addition creates overlapping regions between first and second touch electrodes, increasing mutual capacitance and improving touch detection performance across the display surface

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Measurement precision

If branch electrodes are added to enhance mutual capacitance, then touch linearity improves, but device complexity increases

Engineering Contradiction:

Improvetouch position detection accuracyVSAvoidelectrode pattern complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Branch electrodes are strategically positioned in specific regions where they overlap with opposing touch electrodes to maximize mutual capacitance enhancement. The connection electrodes are localized to specific areas, allowing improved touch detection precision in critical regions without uniformly increasing complexity across the entire electrode structure

Inventive Principle:

Principle #3Local quality

3Reliability

If multiple touch electrodes and branch electrodes are integrated, then touch sensitivity enhances, but manufacturing difficulty increases

Engineering Contradiction:

Improvetouch sensitivityVSAvoidmanufacturing ease

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The first and second touch electrodes serve multiple functions: they act as sensing elements for touch detection, provide structural support, and create overlapping regions for enhanced mutual capacitance. The branch electrodes similarly serve both as capacitance-enhancing elements and as structural components defining the electrode pattern, reducing the need for separate manufacturing steps

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

The enhanced mutual capacitance and improved touch linearity allow for accurate detection of touch positions, reducing differences in touch performance across regions and enhancing overall touch panel sensitivity.

Implementation Method 1

at least one of the first region and the second region includes the branch electrodes of the first touch electrode and the branch electrodes of the second touch electrode, and a gap is defined between each of the branch electrodes of the first touch electrode and each of the branch electrodes of the second touch electrode which are disposed in the same region

Methodology Applied

Scientific EffectMutual capacitance: Capacitance

Data Source

PatentUS12566529B2Touch electrode structure with branch electrodes, touch panel and display device

Publication Date: 2026.03.03 CHENGDU BOE OPTOELECTRONICS TECH CO LTD

AI summary

Provided is a touch electrode structure. The touch electrode structure includes a plurality of touch electrode patterns, wherein each of the touch electrode patterns includes a first touch electrode and a second touch electrode, and the first touch electrodes and second touch electrodes of touch electrode patterns of the touch electrode structure are insulated. Branch electrodes of the first touch electrode and branch electrodes of the second touch electrode are disposed in at least one of a first region defined by first main body electrodes of two first touch electrodes and a second region defined by second main body electrodes of two second touch electrodes.