Display Touch Detection Using Elastic Capacitive Support
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing solutions fail to accurately detect soft touches on screen surfaces, such as those found in mobile devices, due to interference from parasitic signals and limited sensitivity.
Innovation Solution
A capacitive detection system utilizing a screen panel with an electrode assembly that forms a capacitor, where the capacitance changes with load, combined with an elastic support and a modified gyrator circuit for high sensitivity and interference suppression, allowing for reliable contact detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional touch detection methods are used, then the system can detect hard touches, but it fails to accurately detect soft touches due to parasitic signals and limited sensitivity
Solution Approach 1:
The patent replaces conventional mechanical or resistive touch detection with a capacitive sensing system. The support structure with elastic elements forms a capacitor whose capacitance changes in response to touch forces, enabling detection of soft touches that were previously indistinguishable from parasitic signals in conventional systems
Solution Approach 2:
The patent changes the detection parameter from direct electrical contact or resistance measurement to capacitance measurement. By monitoring capacitance changes in the support structure, the system can detect the subtle mechanical deformations caused by soft touches, achieving superior measurement precision while filtering out parasitic electrical signals
2Measurement precision
If a capacitive sensor system is implemented, then soft touch detection sensitivity is improved, but the device complexity increases due to additional components
Solution Approach 1:
The support structure serves multiple functions: it provides mechanical support for the screen panel, enables capacitive sensing through its elastic elements, and acts as part of the capacitor structure itself. This multi-functionality reduces overall device complexity while maintaining high soft touch detection sensitivity
Solution Approach 2:
The patent merges the support structure with the capacitive sensing elements. The elastic support elements directly form part of the capacitor, eliminating the need for separate sensing components and reducing system complexity while achieving high measurement precision for soft touch detection
3Stability of the object's composition
If the screen panel is made more rigid to improve structural stability, then the sensitivity to soft touches decreases
Solution Approach 1:
The patent segments the support function from the screen panel itself, using separate elastic support elements beneath the panel. This allows the screen panel to remain rigid for structural stability while the support elements provide the necessary compliance for detecting soft touches through capacitance changes
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 precise detection of soft touches with high accuracy and minimal construction changes, integrating a compact and sensitive capacitive sensor that suppresses parasitic signals, suitable for mobile devices and gaming computers.
Implementation Method 1
the electrode assembly being coupled with the screen panel and forming part of a capacitor whose capacitance changes when the support is subjected to a load
Implementation Method 2
a support carrying the screen panel such that it is moved by a compression force exerted by contact with the screen panel
Data Source
AI summary
A display screen is carried on a base by an elastically deformable support such that a touch shifts the screen relative to the base. A pair of juxtaposed electrodes form a capacitor, with one of the electrodes fixed to the screen and the other of the electrodes fixed to or formed by the base. A capacitance of the capacitor changes when the screen electrode moves relative to the base electrode. A circuit connected to the electrodes initiates an action on change of the capacitance.