Touch Module With Integrated Capacitive Pressure Sensing

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Solution Overview

Problem

Capacitive touch apparatuses require additional pressure sensors to sense pressing force, increasing circuit complexity and cost.

Innovation Solution

A touch module with a touch capacitive layer and a pressure sensing layer that utilize a single type of capacitance signal to determine touch location and pressure, eliminating the need for additional pressure sensors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If an additional pressure sensor is introduced to sense pressing force, then touch pressure detection capability is improved, but circuit complexity increases

Engineering Contradiction:

Improvetouch pressure detection capabilityVSAvoidcircuit complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent merges the touch sensing function and pressure detection function into a single capacitive sensing system. The touch capacitive layer detects both touch location and touch pressure by analyzing capacitance signal variations, eliminating the need for separate pressure sensors and reducing circuit complexity while maintaining detection capabilities.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The capacitive sensing system is designed to perform multiple functions: detecting touch location, detecting touch pressure, and determining touch operations. By making the capacitive sensor universal, the patent avoids adding specialized pressure sensors, thereby reducing device complexity while improving measurement precision for pressure detection.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Measurement precision

If an additional pressure sensor is introduced to sense pressing force, then touch pressure detection capability is improved, but device cost increases

Engineering Contradiction:

Improvetouch pressure detection capabilityVSAvoiddevice cost

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent combines touch sensing and pressure detection into one capacitive sensing system, eliminating the need for additional pressure sensor components. This merging reduces material costs, manufacturing complexity, and overall device cost while maintaining the ability to detect touch pressure accurately through capacitance signal analysis.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

By designing the capacitive sensing system to serve multiple purposes (touch location detection, touch pressure detection, and operation identification), the patent avoids the need for separate specialized components, thereby reducing device cost while achieving improved measurement precision for pressure sensing.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Measurement precision

If multiple sensor types are used for touch and pressure sensing, then sensing accuracy is improved, but structure complexity increases

Engineering Contradiction:

Improvesensing accuracyVSAvoidstructure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent merges touch sensing and pressure sensing functions into a single capacitive sensing layer structure. The touch capacitive layer and pressure sensing layer work together as an integrated system, using capacitance signal variations to provide both touch location and pressure information, thereby reducing structural complexity while maintaining sensing accuracy.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The capacitive sensing system is designed to perform multiple sensing functions simultaneously. By making the sensing system universal, the patent eliminates the need for multiple separate sensor structures, reducing overall structure complexity while maintaining the accuracy needed for both touch and pressure detection.

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

Reduces circuit complexity and cost while enabling efficient touch pressure detection and multi-point pressure sensing, enhancing user experience.

Implementation Method 1

The touch capacitive layer is configured to output a capacitance signal, and a signal value of the capacitance signal is related to a variation of the pressure sensing layer

Methodology Applied

Scientific EffectCapacitance: Capacitance

Implementation Method 2

The pressure sensing layer is configured to change under an action of touch pressure, and a signal value of the capacitance signal is related to a variation of the pressure sensing layer

Methodology Applied

Scientific EffectPressure-induced deformation: Deformation

Data Source

PatentUS20250335063A1Touch module, electronic device, touch accessory, and touch detection method

Publication Date: 2025.10.30 HUAWEI TECH CO LTD

AI summary

This application provides a touch module, an electronic device, a touch accessory, and a touch detection method. The touch module includes a touch capacitive layer and a pressure sensing layer. The touch capacitive layer and the pressure sensing layer are disposed opposite to each other. The touch capacitive layer is configured to output a capacitance signal, and the capacitance signal is used to determine a touch location of a touch operation. The pressure sensing layer is configured to change under an action of touch pressure, and a signal value of the capacitance signal is related to a variation of the pressure sensing layer.