Capacitive Touch Load Control With Tactile Switching and LED Feedback

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Solution Overview

Problem

Traditional load control devices lack the capability to perform advanced user interactions and provide visual feedback, limiting their functionality and usability with modern electrical loads.

Innovation Solution

A load control device featuring a capacitive touch surface and a control circuit that detects touch and tactile inputs to control electrical loads, allowing for advanced features like intensity and color adjustment, and includes a pivotable actuation member for mode switching and programming.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If traditional mechanical toggle switches are used, then device simplicity is maintained, but functionality and user interaction capability are limited

Engineering Contradiction:

ImprovefunctionalityVSAvoiddevice complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent replaces traditional mechanical toggle switches with capacitive touch sensing technology. The capacitive touch surface detects user input through changes in capacitance rather than mechanical movement, enabling advanced interaction modes (tap, hold, swipe) while maintaining a sleek, simple device appearance. This substitution provides multifunctionality without increasing mechanical complexity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The control device integrates multiple functions into a single unit: dimming control, on/off switching, preset selection, and visual feedback through LEDs. The capacitive touch interface supports various input gestures (tap, hold, swipe) that trigger different functions, making the device versatile while maintaining a compact form factor.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of operation

If traditional buttons and levers are used, then ease of manufacture is maintained, but user feedback and interaction capability are limited

Engineering Contradiction:

Improveuser interactionVSAvoidease of manufacture

Core Design Contradiction:

Ease of operationVSEase of manufacture

Solution Approach 1:

The patent replaces mechanical buttons and levers with a capacitive touch surface that detects user input through electrical field changes. This eliminates the need for mechanical moving parts, reducing assembly complexity while enabling sophisticated user interactions such as tap-to-dim, hold-to-preset, and swipe-to-adjust functions.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The capacitive touch surface provides visual feedback through integrated LEDs that illuminate in response to user input, eliminating the need for separate feedback mechanisms. The system automatically responds to user gestures with appropriate control actions and visual confirmation, enhancing ease of operation without adding manual feedback components.

Inventive Principle:

Principle #25Self-service

3Loss of information

If simple actuation mechanisms are used, then device reliability is maintained, but visual feedback and operational information are insufficient

Engineering Contradiction:

Improvevisual feedbackVSAvoiddevice reliability

Core Design Contradiction:

Loss of informationVSReliability

Solution Approach 1:

The patent incorporates LED indicators that provide visual feedback to users about device state and response to input. LEDs illuminate to confirm touch detection, indicate dimming levels, and show operational status, ensuring users have complete information about system state without compromising the reliability of the control mechanism.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

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

Enhances user interaction and provides visual feedback, enabling advanced control of electrical loads through capacitive touch technology, improving usability and aesthetic appeal.

Implementation Method 1

an actuation member having a front surface defining a touch sensitive surface (e.g., capacitive touch surface) configured to detect a touch actuation

Methodology Applied

Scientific EffectCapacitive sensing: Capacitance

Data Source

PatentUS20260031813A1Load control device having a capacitive touch surface

Publication Date: 2026.01.29 LUTRON TECHNOLOGY COMPANY LLC

AI summary

A control device configured for use in a load control system to control an electrical load external to the control device may comprise an actuation member having a front surface defining a capacitive touch surface configured to detect a touch actuation along at least a portion of the front surface. The control device includes a main printed circuit board (PCB) comprising a control circuit, a tactile switch, a controllably conductive device, and a drive circuit operatively coupled to a control input of the controllably conductive device for rendering the controllably conductive device conductive or non-conductive to control the amount of power delivered to the electrical load. The control device also includes a capacitive touch PCB that comprises a touch sensitive circuit comprising one or more receiving capacitive touch pads located on the capacitive touch PCB and arranged in a linear array adjacent to the capacitive touch surface.