Touch Input Device Floating Ground State Signal Restoration

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Solution Overview

Problem

Touch input devices often experience malfunctions when in a floating ground state, leading to signal disappearance or splitting, which affects the accuracy of touch detection.

Innovation Solution

A touch input device and method that utilize a control unit to differentiate between normal and floating ground states by analyzing receiving signals from a plurality of electrodes, and restore signals in a floating ground state to a normal state with minimal additional driving time and power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the touch sensor is operated in a floating ground state, then the device can be used without external power connection, but the touch signal detection accuracy deteriorates due to signal disappearance or splitting

Engineering Contradiction:

ImproveportabilityVSAvoidtouch signal detection accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The system dynamically changes operating parameters by detecting ground state conditions and switching between different signal processing modes. When floating ground state is detected through electrode signal analysis, the system adjusts its touch detection algorithm to compensate for the altered electrical characteristics, thereby maintaining measurement precision across different operational states

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system continuously monitors the receiving signals from multiple electrodes to detect ground state conditions. This feedback mechanism allows the system to identify when it is operating in a floating ground state and automatically adjust its signal processing accordingly, preventing signal interpretation errors while maintaining ease of operation

Inventive Principle:

Principle #23Feedback

2Measurement precision

If additional driving operations are performed to restore signals in floating ground state, then touch detection accuracy improves, but power consumption and driving time increase

Engineering Contradiction:

Improvetouch signal detection accuracyVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

Instead of performing complete additional driving operations, the system applies partial compensation by adjusting signal processing parameters only when floating ground state is detected. This selective approach restores sufficient signal accuracy without the full overhead of continuous additional driving, thereby reducing power consumption while maintaining measurement precision

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The system periodically detects ground state conditions and applies signal restoration only when needed, rather than continuously. This periodic operation allows the system to maintain accuracy during floating ground state while minimizing the time and power spent on restoration operations, achieving a balance between measurement precision and energy efficiency

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS12299234B2Touch input device and method with determination of floating ground state

Publication Date: 2025.05.13 HIDEEP INC

AI summary

Embodiments of the present invention relate to a touch input device and a touch driving method thereof, in more detail, it can determine a floating ground state of the touch input device and a magnitude (severity) of the floating ground state, it relates to a touch driving method thereof, which is a touch input device that can restore a touch signal detected in a floating ground state into a touch signal in a normal ground state.