Touch Display Frequency Adaptation for Noise Interference
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Solution Overview
Problem
Existing touch-sensitive displays in portable electronic devices face challenges with noise interference at fixed drive frequencies, leading to inaccurate touch detection and increased noise levels when coupled to external power sources, limiting their reliability and accuracy.
Innovation Solution
The method involves identifying and switching between multiple drive frequencies based on noise thresholds to optimize touch detection, determining a first noise value and switching to a second frequency if it's below a certain threshold, and identifying new frequencies when noise levels exceed a high threshold, ensuring accurate touch data collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed drive frequency is used for touch-sensitive display, then device complexity is reduced, but noise interference increases leading to inaccurate touch detection
Solution Approach 1:
The patent implements dynamic frequency selection by monitoring noise levels at the current drive frequency and switching to alternative frequencies when noise thresholds are exceeded. The system transitions from a static fixed-frequency approach to a dynamic adaptive frequency selection mechanism that responds to real-time noise conditions, thereby maintaining touch detection accuracy without excessive complexity.
Solution Approach 2:
The system changes the drive frequency parameter adaptively based on measured noise conditions. When noise at the current frequency exceeds acceptable thresholds, the system switches to a different drive frequency to optimize touch detection. This parameter change approach allows the system to maintain measurement precision while managing complexity through intelligent frequency selection rather than hardware complexity.
2Reliability
If multiple drive frequencies are monitored and switched between, then touch detection accuracy improves, but device complexity and processing overhead increase
Solution Approach 1:
The patent employs feedback mechanisms by continuously monitoring noise levels at the current drive frequency and using this information to determine when to switch frequencies. The system measures noise, compares it against thresholds, and adjusts frequency selection based on this feedback loop. This feedback-driven approach improves reliability by ensuring touch detection operates under optimal noise conditions while managing system complexity through intelligent control algorithms.
Solution Approach 2:
The system performs self-diagnosis and self-adjustment by autonomously monitoring its own noise conditions and selecting appropriate drive frequencies without external intervention. The touch-sensitive display system serves itself by detecting noise levels and automatically switching frequencies to maintain optimal performance, reducing the need for complex external control mechanisms.
3Measurement precision
If noise threshold monitoring is implemented, then false positives and missed detections are reduced, but processing time and energy consumption increase
Solution Approach 1:
The system changes operational parameters (drive frequency) based on noise threshold monitoring to optimize touch detection precision. By switching frequencies when noise thresholds are exceeded, the system maintains high detection precision while managing energy consumption through intelligent frequency selection rather than continuous high-power operation at a single frequency.
Data Source
AI summary
A method includes identifying a first plurality of drive frequencies at which drive electrodes of a touch-sensitive display of an electronic device are driven, wherein the first plurality of drive frequencies includes a first frequency and a second frequency. A first noise value at the first frequency is determined. When the first noise value meets a first threshold value and the first noise value is less than a second threshold value that is greater than the first threshold value, a second noise value at the second frequency is determined by the electronic device and, in response to determining that the second noise value is less than the first threshold value, driving the drive electrodes at the second frequency. When the first noise value meets the second threshold value, a third frequency at which the drive electrodes are driven is identified by the electronic device, wherein the third frequency is not one of the first plurality of drive frequencies.