Transparent Capacitive Knob Interface for Center-Area Sensing
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Solution Overview
Problem
Conventional knob interfaces with larger inner diameters and smaller outer diameters limit the space for capacitive coupling between knob hardware and touch pixels, restricting functionalities and feature configurations.
Innovation Solution
Incorporating a transparent conductive material layer that electrically couples grid electrodes to knob interface electrodes, allowing for additional sensing functions within the center area while maintaining display capabilities, such as click and grab functionalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a donut shaped exterior with a center area free of opaque conductive material is used, then display information and touch detection functionalities are enabled, but the space for capacitive coupling between knob hardware and touch pixels is limited
Solution Approach 1:
A transparent conductive material layer is introduced as an intermediary between the knob interface electrodes and the grid electrodes. This transparent layer allows electrical coupling while maintaining optical transparency, enabling the center area to serve both display and sensing functions simultaneously without blocking light or requiring opaque conductive materials.
Solution Approach 2:
The center area of the knob interface is designed to perform multiple functions: it serves as a display region, a touch detection zone, and a capacitive coupling area through the transparent conductive material. By making the conductive material transparent, the same physical space supports both visual output and electrical sensing operations.
2Volume of moving object
If larger inner diameters and smaller outer diameters are used for the donut shaped exterior, then the knob interface size is reduced, but the space available for capacitive coupling is further limited
Solution Approach 1:
The patent changes the optical parameter (transparency) of the conductive material to resolve the spatial constraint. By using transparent conductive material instead of opaque material, the effective usable area is increased without changing the physical dimensions of the knob interface, allowing smaller knobs to maintain adequate capacitive coupling space.
3Device complexity
If touch pixels are avoided in the center area and only touch pixels on the donut shaped exterior are used, then the knob interface structure is simplified, but the functionalities and features that can be configured are limited
Solution Approach 1:
The transparent conductive material acts as a mediator that enables grid electrodes to be positioned and electrically coupled within the center area without requiring separate touch pixel structures. This maintains structural simplicity while expanding functional capabilities.
Solution Approach 2:
The patent utilizes the transparent conductive material layer as an additional dimensional element that enables electrical coupling in the center area without interfering with the display function. This adds a new layer of functionality without increasing structural complexity in the traditional sense.
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 the signal-to-noise ratio and enables more functionalities by utilizing additional sensing electrodes, even in smaller knob designs, without compromising display functionality.
Implementation Method 1
the transparent conductive material layer configured to electrically couple the subset of the plurality of grid electrodes to the one or more knob interface electrodes
Data Source
AI summary
A system for using a transparent conductive material layer for a knob interface is provided. The system comprises: the knob interface comprising a fixed base and one or more knob interface electrodes; the transparent conductive material layer configured to electrically couple the subset of the plurality of grid electrodes to the one or more knob interface electrodes; and a processing system. The processing system is configured to: drive the plurality of grid electrodes with one or more signals; receive one or more resulting signals based on driving the plurality of grid electrodes with the one or more signals; and perform one or more actions based on the one or more resulting signals.