Touch Sensitive Device Induction Unit Ghost Touch Elimination
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Solution Overview
Problem
Conventional self-capacitance type touch screens suffer from issues such as ghost touch points, complex structure, high cost, coordinate drift due to external factors, and low signal-to-noise ratio, making multipoint touch detection difficult and increasing interference from stray capacitance and level signals.
Innovation Solution
A touch sensitive device with induction units on a substrate, featuring a first and second electrode connected via structures, using a novel self-capacitor detection method where the touch position divides the induction unit into two resistors, allowing for improved linearity and reduced noise by calculating the ratio between these resistors to determine the touch position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a diamond structure with two different layers is used for induction units, then linearity is improved, but ghost touch points appear frequently and structure complexity increases
Solution Approach 1:
The induction unit is divided into multiple independent detection regions (first detection region and second detection region) with different detection directions. Each region independently detects touch signals, allowing the system to distinguish between real touch points and ghost touch points by comparing signals from different regions, thereby eliminating ghost touch issues while maintaining linearity.
2Manufacturing precision
If a double-layer screen structure is used, then linearity is improved, but structure complexity and cost increase
Solution Approach 1:
A single-layer screen structure is designed to perform multiple functions: it provides both the induction unit for touch detection and the detection electrode for signal sensing. This integrated design eliminates the need for separate double-layer structures while maintaining detection accuracy and linearity, thereby reducing structural complexity and manufacturing cost.
3Device complexity
If a triangular induction unit structure is used, then structure simplicity is improved, but induction capacitance is not optimized and signal-to-noise ratio decreases
Solution Approach 1:
The induction unit adopts a rectangular structure with optimized dimensions and aspect ratio to maximize induction capacitance. The detection electrode is designed with specific geometric parameters to enhance coupling with the induction unit, thereby optimizing the signal-to-noise ratio while maintaining structural simplicity for easy manufacturing.
4Device complexity
If single-end detection is performed, then structure simplicity is improved, but induction capacitance is not optimized and signal-to-noise ratio decreases
Solution Approach 1:
The detection system transitions from single-end detection to dual-end detection by adding a second detection electrode at the opposite end of the induction unit. This dimensional expansion allows simultaneous detection from both ends, optimizing induction capacitance utilization and significantly improving the signal-to-noise ratio while maintaining manageable structural complexity.
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 enhances linearity, reduces noise, and improves the signal-to-noise ratio, allowing for accurate multipoint touch detection while simplifying the structure and reducing interference, thus addressing the limitations of conventional self-capacitance type touch screens.
Implementation Method 1
A self-capacitance detecting sub-module is used to detect the induction unit. The detecting module is configured to apply a level signal to the first electrode and/or the second electrode to charge a self capacitor generated by a touch on an induction unit
Implementation Method 2
perform a charge detection from the first electrode and/or the second electrode to obtain a first charge detecting value and a second charge detecting value
Data Source
AI summary
An induction unit, a touch detecting assembly, and a touch sensitive device are provided. The touch sensitive device comprises: a substrate (100); a plurality of induction units (200) not intersecting with each other, and a detecting module (300) connected with the first electrodes (210) and the second electrodes (220) respectively. The induction unit (200) comprises a first electrode (210), a second electrode (220), a plurality of first structures (230) and a plurality of second structures (240). The plurality of first structures (230) are connected end to end via the plurality of second structures (240). The detecting module (300) is configured to apply a level signal to the first electrodes (210) and/or the second electrodes (220) to charge a self capacitor, to calculate a ratio between a first resistor and a second resistor, and to determine a touch position in a first direction and a touch position in a second direction.