Branch-and-Bridge Touch Panel Pattern for Signal Integrity

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Solution Overview

Problem

Traditional touch patterns in capacitive touch panels suffer from sensitivity issues and signal degradation, particularly in foldable covers due to poor grounding, limiting their versatility and performance.

Innovation Solution

A touch panel design featuring a plurality of first and second electrodes with bridge structures, where each electrode has specific branch configurations and alternately arranged branches, forming sensing units with optimized structural parameters to enhance mutual capacitance and reduce signal attenuation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional touch patterns (snowflake or diamond pattern) are used, then the touch panel can be manufactured with conventional designs, but the sensitivity and signal intensity deteriorate in cases of poor grounding

Engineering Contradiction:

Improvetouch sensitivityVSAvoidsignal degradation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The electrode pattern is segmented into multiple branches (first branch, second branch, third branch, fourth branch for first electrode; fifth branch, sixth branch, seventh branch, eighth branch for second electrode) connected through bridge structures. This segmentation allows each branch to be optimally positioned and connected, improving signal distribution and reducing degradation in poor grounding conditions while maintaining manufacturing feasibility.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements local optimization by specifically designing the bridge structures to connect certain branches (first branch to second branch, third branch to fourth branch) while arranging branches in alternating patterns. This local quality enhancement at critical connection points improves overall touch sensitivity and signal integrity without requiring complete redesign of the entire electrode pattern.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If traditional touch patterns are used, then the design is simple and manufacturing is easier, but the pattern doesn't work well in foldable covers due to lack of versatility

Engineering Contradiction:

Improvecompatibility with different structuresVSAvoidelectrode pattern complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The electrode pattern design with alternating branch arrangements and bridge structures creates a universal pattern that can be effectively applied across different device structures including foldable covers, rigid displays, and flexible displays. The modular branch-and-bridge architecture allows the same pattern to adapt to various form factors and structural requirements without requiring structure-specific redesigns.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If bridge structures are added to connect electrode branches, then signal intensity increases and degradation reduces, but the device complexity increases

Engineering Contradiction:

Improvesignal integrityVSAvoidelectrode structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The bridge structures serve as merged elements that simultaneously perform multiple functions: they connect electrode branches to maintain electrical continuity, provide structural support for the alternating branch arrangement, and optimize signal distribution pathways. By merging these functions into single structural elements, the patent reduces overall complexity despite adding connection components.

Inventive Principle:

Principle #5Merging (Combining)

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 new design increases signal intensity and reduces signal degradation, enabling improved touch sensitivity and versatility across different structures, including foldable covers.

Implementation Method 1

Each of the bridge structures connects the first branch and the second branch of the first electrode

Methodology Applied

Scientific EffectElectrical Conduction: Conduction (electrical)

Implementation Method 2

Capacitive touch panels with mutual capacitance are capable of detecting changes in mutual capacitance. This is achieved by the mutual capacitance of the electrode pattern of the touch sensor

Methodology Applied

Scientific EffectMutual Capacitance: Capacitance

Data Source

PatentUS12417005B1Touch panel with well-designed touch pattern

Publication Date: 2025.09.16 NOVATEK MICROELECTRONICS CORP

AI summary

The touch panel includes a plurality of first electrodes, a plurality of second electrodes, and a plurality of bridge structures. Each of the first electrodes includes a first branch, a second branch, a third branch and a fourth branch. The first and second branches are opposite to each other, and the third and fourth branches are opposite to each other. Each of the second electrodes includes a fifth branch, a sixth branch, a seventh branch and an eighth branch. The fifth and sixth branches are adjacently connected to each other, and the seventh and eighth branches are adjacently connected to each other. Each of the bridge structures connects the first and second branches of the first electrode. The third branch, the seventh branch, the first branch and the fifth branch are alternately arranged, and the fourth branch, the eighth branch, the second branch and the sixth branch are alternately arranged.