Pressure Capacitive Reference Fixed to Housing for Touch Sensing
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Solution Overview
Problem
Current pressure sensing technologies in touch surfaces of electronic devices face challenges in accurately measuring pressure inputs and determining their location, often resulting in inefficiencies and inaccuracies in user input detection.
Innovation Solution
A capacitance system integrated into electronic devices, featuring a housing with a cavity containing a capacitance module, pressure electrodes, and a reference pressure electrode, measures capacitance differences to determine pressure inputs and their location, enabling precise detection and triggering haptic responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pressure sensing technologies are used in touch surfaces, then pressure input detection is enabled, but measurement accuracy and location detection precision are insufficient
Solution Approach 1:
The patent combines the pressure sensing function with the touch surface structure by integrating pressure electrodes directly into the touch surface layers. The first pressure electrode is incorporated into the first substrate and the second pressure electrode into the second substrate, merging the pressure sensing function with the existing touch surface structure rather than adding separate pressure sensing components.
Solution Approach 2:
The touch surface structure is designed to serve multiple functions: it acts as both the touch interface and the pressure sensing element. The capacitive layers and electrodes that form the touch sensing mechanism also function as pressure sensors, eliminating the need for dedicated pressure sensing components and improving measurement accuracy through the dual-function design.
2Measurement precision
If multiple electrodes and layers are added to improve pressure detection accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
The pressure sensing system is segmented into distinct functional layers: the first pressure electrode in the first substrate, the second pressure electrode in the second substrate, and the reference electrode. This segmentation allows each layer to be optimized for its specific function while maintaining overall system simplicity through modular construction.
Solution Approach 2:
The reference electrode serves as an intermediary element that enables accurate pressure location detection without requiring complex electrode arrangements. By providing a stable reference point against which the capacitance changes of the pressure electrodes are measured, the system achieves high measurement precision with a relatively simple three-electrode configuration.
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
This solution allows for accurate measurement of pressure inputs and their location, enhancing user input detection and providing a more responsive user experience by utilizing capacitance changes to determine the magnitude and location of pressure applied to the touch surface.
Implementation Method 1
measuring a first capacitance between a substrate pressure electrode on a substrate and a pressure capacitance reference fixed to a housing; measuring a second capacitance between the substrate pressure electrode and the pressure capacitance reference
Data Source
AI summary
A capacitance system may include a housing of the electronic device; the housing defining a cavity; a pressure capacitance reference fixed to the housing; a capacitance module disposed deposed within the cavity; a pressure electrode incorporated into the capacitance module where the pressure capacitance reference is detectable with the pressure electrode of the capacitance module.