Capacitive Touch Button Structure for Accurate Signal Detection

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Solution Overview

Problem

Existing button structures for projected capacitive touch panels are costly to produce and require multiple sensing film layers, leading to inaccurate signal detection and limited button types due to complex sensing capacitance changes.

Innovation Solution

A button structure comprising a capacitive touch sheet, conductive rubber, and button cap that generates input signals by conducting the conductive rubber with the capacitive touch sheet, providing physical feedback without additional components like sockets or silent rings, and allowing direct mounting on touch screens without requiring mold modifications.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple layers of sensing film layers are equipped to sense button input signals, then the button sensing capability is improved, but the sensing capacitance changes become complex and signal detection accuracy deteriorates

Engineering Contradiction:

Improvebutton sensing capabilityVSAvoidsignal detection accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent extracts the sensing function from multiple complex film layers and concentrates it into a single capacitive touch sensor layer. This simplifies the sensing structure while maintaining the button detection capability, thereby improving signal detection accuracy without sacrificing reliability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the sensing mechanism from complex multi-layer capacitance changes to a simplified single-layer capacitive touch sensing system. By altering the sensing parameter structure, it achieves more accurate and reliable button input detection

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If a mold is produced for button addition location and circuits are set up accordingly, then the button structure is customized, but the production cost increases

Engineering Contradiction:

Improvebutton customizationVSAvoidproduction cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent creates a universal button structure that can be applied to various touch panel applications without requiring custom molds or circuit setups. The standardized design with a button body, capacitive touch sensor, and conductive rubber element can be universally manufactured and adapted to different devices, significantly reducing production costs while maintaining versatility

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent segments the button structure into standardized modular components (button body, capacitive touch sensor layer, conductive rubber, button cap) that can be independently manufactured and assembled. This modular approach eliminates the need for custom molds while allowing flexibility in button configuration and application

Inventive Principle:

Principle #1Segmentation

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

Enables accurate signal detection and physical feedback while reducing production costs and eliminating the need for complex sensing film layers, allowing versatile button applications on various devices.

Implementation Method 1

a capacitive touch sheet disposed on the touch screen and positioned inside the button body

Methodology Applied

Scientific EffectCapacitance: Capacitance

Implementation Method 2

the conductive rubber and the capacitive touch sheet are conducted to generate an input signal to the touch screen

Methodology Applied

Scientific EffectElectrical Conduction: Conduction (electrical)

Data Source

PatentUS20250321648A1Button structure of projected capacitive touch panel

Publication Date: 2025.10.16 SILICON INTEGRATED SYSTEMS CORP

AI summary

A button structure of projected capacitive touch panel disposed on a touch screen, wherein the button structure of projected capacitive touch panel includes: a button body disposed on the touch screen; a capacitive touch sheet disposed on the touch screen and positioned inside the button body; a conductive rubber disposed inside the button body, wherein the conductive rubber includes a contact portion which can contact the capacitive touch sheet; a button cap including a connecting body and a cover body, wherein the connecting body is disposed on the conductive rubber, and wherein the cover body protrudes out of the button body. The contact portion contacts the capacitive touch sheet when the button cap is pressed down, which causes the touch screen to generate an input signal by conducting the conductive rubber with the capacitive touch sheet.