Touch Sensing Part Reference Value Adjustment
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Solution Overview
Problem
Existing touch sensing technologies face challenges in preventing the 'ghost touch' phenomenon, especially in low-temperature environments where ambient conditions affect capacitance readings.
Innovation Solution
A driving method for a touch sensing part that involves a first sensing electrode and a second sensing electrode, where the reference value is adjusted based on changes in capacitance, particularly by decreasing the reference value during low temperatures and maintaining it uniformly during touch events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reference value is adjusted based on ambient temperature to prevent ghost touch, then touch sensing reliability is improved, but the system complexity increases due to additional temperature sensing and dynamic reference value adjustment mechanisms
Solution Approach 1:
A temperature sensor is introduced as an intermediary component to detect ambient temperature and provide input to the sensing control part. This mediator enables the system to adapt reference values based on temperature conditions without requiring complex direct monitoring of capacitance drift, thereby improving reliability while managing complexity through a dedicated sensing component.
Solution Approach 2:
The reference value is transformed from a static parameter to a dynamic one that automatically adjusts based on ambient temperature conditions. The sensing control part implements dynamic reference value modification during non-touch periods when temperature changes are detected, allowing the system to adapt to environmental variations and prevent ghost touch phenomena.
2Reliability
If the reference value is dynamically adjusted during non-touch periods to track capacitance changes, then ghost touch prevention is improved, but the response time for accurate touch detection may be affected due to the additional adaptation period
Solution Approach 1:
The system performs preliminary adjustment of the reference value during non-touch periods before actual touch events occur. By proactively tracking capacitance changes and modifying the reference value in advance during idle time, the system prepares for upcoming touch detections, ensuring accurate ghost touch prevention without compromising response time when users actually interact with the device.
Solution Approach 2:
The reference value adjustment operates periodically during non-touch intervals rather than continuously. The sensing control part monitors capacitance changes and modifies reference values at appropriate intervals when no touch is detected, allowing the system to maintain accuracy while minimizing the impact on touch detection response time by suspending adjustments during active touch periods.
3Measurement precision
If the reference value is maintained uniformly during touch periods, then touch sensing accuracy is improved, but the system's adaptability to temperature changes during touch events is reduced
Solution Approach 1:
The operational periods are segmented into distinct phases: non-touch periods for reference value adjustment and touch periods for stable measurement. During non-touch periods, the system adapts the reference value to temperature changes; during touch periods, it maintains uniform reference values to ensure accurate touch detection. This temporal segmentation allows both adaptability and precision to coexist without interference.
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 approach effectively prevents the ghost touch phenomenon by ensuring that the capacitance remains greater than the reference value after touch sensing, even in low-temperature conditions.
Implementation Method 1
sensing a touch of a user by comparing a capacitance formed by a first sensing electrode and a second sensing electrode crossing the first sensing electrode with a reference value
Implementation Method 2
a temperature sensor that senses an ambient temperature
Data Source
AI summary
A driving method of a touch sensing part includes sensing a touch of a user by comparing a capacitance formed by a first sensing electrode and a second sensing electrode crossing the first sensing electrode with a reference value in a reference touch mode, varying the reference value such that the reference value decreases along a decrease in the capacitance, during a first period, when an ambient temperature is lower than a reference temperature, sensing the user's touch by comparing the reference value and the capacitance, with the reference value maintained uniformly, during a second period following the first period, when the touch of the user is made, and varying the reference value such that the reference value decreases, during a third period following the second period.