Capacitive Electrode Hole Layout for Uniform High-Sensitivity Sensing

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Solution Overview

Problem

Conventional capacitive detection devices face challenges in reducing the size of the common electrode capacitor, maintaining uniformity of capacitive detection areas, and enhancing sensitivity while minimizing signal detection range and noise interference.

Innovation Solution

A capacitive detection device with a capacitive detection area featuring independent conductive regions, a peeled-off empty space, and a shielding capacitor to reduce common electrode capacitance and improve signal-to-noise ratio, using a differential driving voltage method to detect additional capacitance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the common electrode capacitor size is reduced, then sensitivity is improved, but the capacitive detection area uniformity deteriorates

Engineering Contradiction:

ImprovesensitivityVSAvoidcapacitive detection area uniformity

Core Design Contradiction:

Measurement precisionVSStability of the object's composition

Solution Approach 1:

The capacitive detection area is divided into multiple independent conductive regions, each with its own common electrode capacitor. This segmentation allows individual optimization of capacitor sizes while maintaining overall uniformity through controlled variations, resolving the contradiction between reducing capacitor size for sensitivity and maintaining uniformity for stable operation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different common electrode capacitors are designed with locally optimized properties - some with smaller sizes for high sensitivity in specific detection zones, while others maintain larger sizes for stability. The empty hole structures are strategically placed in specific regions to achieve local capacitance optimization without compromising overall uniformity.

Inventive Principle:

Principle #3Local quality

2Measurement precision

If the common electrode capacitor size is reduced, then sensitivity is improved, but noise interference increases

Engineering Contradiction:

ImprovesensitivityVSAvoidnoise interference

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

Empty hole structures are introduced as intermediary elements between the capacitive detection areas and the common electrode capacitors. These empty holes act as shielding structures that reduce parasitic capacitance and noise interference, allowing the use of smaller common electrode capacitors for high sensitivity while maintaining low noise levels.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The empty hole structures create a porous-like configuration in the electrode layout, reducing the effective capacitance area and minimizing parasitic capacitance effects. This porous arrangement allows smaller common electrode capacitors to operate with reduced noise interference while maintaining detection sensitivity.

Inventive Principle:

Principle #31Porous materials

3Area of stationary object

If the capacitive detection area is minimized, then device size is reduced, but signal detection range deteriorates

Engineering Contradiction:

Improvedevice sizeVSAvoidsignal detection range

Core Design Contradiction:

Area of stationary objectVSDifficulty of detecting and measuring

Solution Approach 1:

Multiple capacitive detection areas with different sizes and configurations are nested within the device structure. Smaller detection areas provide high sensitivity for localized input, while the overall arrangement maintains adequate detection range. The empty hole structures are nested within the electrode patterns to optimize space utilization.

Inventive Principle:

Principle #7Nested doll (Nesting)

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 solution effectively reduces common electrode capacitance, enhances sensitivity, and improves signal resolution by minimizing noise interference, making it suitable for use in mobile terminals and laptops.

Implementation Method 1

a capacitive detection device with a capacitive detection area featuring independent conductive regions, a peeled-off empty space, and a shielding capacitor to reduce common electrode capacitance

Methodology Applied

Scientific EffectCapacitance: Capacitance

Implementation Method 2

shielding capacitor to reduce common electrode capacitance and improve signal-to-noise ratio

Methodology Applied

Scientific EffectElectromagnetic shielding: Faraday Cage

Implementation Method 3

using a differential driving voltage method to detect additional capacitance

Methodology Applied

Scientific EffectCapacitive sensing: Capacitance

Data Source

PatentUS12197688B2How to organize and utilize empty holes

Publication Date: 2025.01.14 LEE SUNG HO

AI summary

The present invention can form a stable system by minimizing the sensitivity distribution of the system caused by the area difference of the object to be detected. This is achieved by adjusting the density of the empty holes formed in the object to be detected, thereby maintaining the effective area of the object to be detected constant.