Touch Sensor Panel Driving Method with Phase-Inverted Signals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Noise in the frequency band of touch sensing signals degrades the precision of touch sensing, and existing methods fail to effectively mitigate this noise.
Innovation Solution
A touch sensor panel driving method that synchronizes touch driving signals with display synchronization signals, using a combination of first and second touch driving signals with 180°-inverted phases, and performs frequency hopping based on noise levels detected through dummy scans to minimize noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a touch driving signal with a specific frequency is used for touch sensing, then touch sensing can be performed, but noise in the corresponding frequency band degrades the precision of touch sensing
Solution Approach 1:
The patent changes the frequency parameter of the touch driving signal by performing frequency hopping to a different frequency band where noise levels are lower. This directly addresses the contradiction by modifying the operating frequency to avoid noisy bands while maintaining touch sensing functionality.
Solution Approach 2:
The patent dynamically adjusts the driving frequency based on detected noise levels. The system monitors the current frequency band's noise characteristics and switches to alternative frequencies when noise is detected, making the frequency selection adaptive rather than fixed.
2Object-affected harmful factors
If the frequency of the touch driving signal is changed to avoid noise, then noise interference is reduced, but additional complexity is introduced for frequency management
Solution Approach 1:
The patent implements periodic dummy scans at different frequencies to detect noise levels and determine optimal operating frequencies. This structured periodic approach simplifies frequency management by establishing a regular pattern for frequency testing and selection, reducing the complexity of continuous frequency optimization.
Solution Approach 2:
The system performs self-diagnosis by conducting dummy scans to detect noise levels and automatically selects appropriate frequencies without external intervention. This self-service mechanism reduces the need for complex external frequency management systems.
3Object-affected harmful factors
If dummy scans are performed to detect noise levels for frequency hopping, then optimal frequency selection is achieved, but additional time is consumed for scanning
Solution Approach 1:
The patent performs dummy scans with partial coverage, testing a limited set of candidate frequencies rather than exhaustively scanning all possible frequencies. This partial action approach achieves sufficient noise level detection accuracy while minimizing the time consumed by dummy scans.
Data Source
AI summary
A touch sensor panel driving method of applying a touch driving signal to a touch sensor panel according to a display synchronization signal according to an embodiment of the present invention includes synchronizing the touch driving signal applied to the touch sensor panel with the display synchronization signal and applying the touch driving signal, in which the touch driving signal includes a first touch driving signal and a second touch driving signal having a 180°-inverted phase to the first touch driving signal.