Multi-touch Electrode Impedance Matrix for Ghost Touch Elimination
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Solution Overview
Problem
Current multi-touch apparatuses are costly to produce due to the use of single-chip controllers and active elements, and they often suffer from 'ghost' touch issues and inaccuracies in recognizing touch inputs.
Innovation Solution
A multi-touch apparatus utilizing a general controller and passive elements, with a lattice structure of drive and sense electrodes, employs a capacitive or resistive sensing method based on impedance changes to accurately detect touch inputs, reducing production costs and eliminating 'ghost' touches by using a controller that selects and outputs specific voltages to detect touch events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single-chip controller or active elements are used in multi-touch apparatus, then the touch input recognition accuracy is improved, but the production cost increases
Solution Approach 1:
The patent replaces expensive single-chip controllers and active elements with a general controller and passive elements. The touch panel uses a matrix of resistive or capacitive sensing cells that can be read by a general controller, eliminating the need for costly dedicated controllers while maintaining touch recognition functionality.
Solution Approach 2:
The patent designs a universal interface where a general controller can read touch inputs from a matrix of passive sensing cells using standard I/O ports. This multi-functional approach allows the same controller to handle various touch detection tasks without requiring specialized hardware, reducing overall system cost.
2Ease of manufacture
If a general controller and passive elements are used, then the production cost is reduced, but the touch input recognition accuracy deteriorates
Solution Approach 1:
The patent divides the touch panel into a matrix of discrete sensing cells formed by intersecting drive and sense electrodes. Each cell can be independently addressed by selecting specific drive and sense lines, allowing the general controller to read touch inputs systematically across the entire matrix using sequential scanning.
Solution Approach 2:
The patent uses feedback signals to detect touch inputs. When a touch occurs, it creates a measurable signal (resistive change or capacitive change) that is read back through the sense electrodes to the general controller, enabling accurate detection despite using passive elements and a general controller.
3Adaptability or versatility
If multiple active elements and general controller are used, then the device functionality is enhanced, but the device complexity increases
Solution Approach 1:
The patent extracts the active control functionality from dedicated controller circuits and relocates it to the general controller's I/O ports. This removes complex dedicated control hardware while maintaining the ability to drive electrodes and read sense signals through software-controlled sequential access.
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
The solution reduces production costs, enhances accuracy in recognizing touch levels and events, rapidly detects touch inputs, and eliminates 'ghost' touches, while using a simple equation to minimize operational complexity.
Implementation Method 1
The capacitive sensing method may recognize the touch input based on a change in a capacitance accumulated in a capacitor caused by the touch input
Implementation Method 2
The resistive sensing method may recognize the touch input based on a resistance value that is changed by a pressure caused by the touch input
Data Source
AI summary
A multi-touch device detecting a touch input by using a passive element comprises a plurality of driving electrodes; a plurality of detection electrodes; a plurality of impedances positioned at an intersecting point of the plurality of driving electrodes and the plurality of detection electrodes; and a control unit selecting a first driving electrode and a first detection electrode from the plurality of driving electrodes and the plurality of detection electrodes, outputting a first voltage on the first driving electrode, outputting a second voltage on at least one of the remaining driving electrodes and at least one of the remaining detection electrodes, and detecting a touch input on a first intersecting point of the first driving electrode and the first detection electrode on the basis of a detection voltage detected from the first detection electrode.