Touch Panel Noise Protection Circuit for Signal Saturation
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Solution Overview
Problem
Touch panel devices often experience erroneous touch event detection due to noise interference from RF signals and high common-mode noise, leading to signal saturation and abnormal operation.
Innovation Solution
A protection circuit with a detection block and a protection block is implemented to detect noise interference and trigger a protection mechanism, which includes designs such as amplitude detection, sample and hold circuits, attenuators, and interrupt mechanisms to mitigate noise effects on touch event detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch panel device operates in a noisy environment with RF signals and low-quality chargers, then the device can maintain basic functionality, but noise interference causes signal saturation and erroneous touch event detection
Solution Approach 1:
The patent introduces a protection circuit as an intermediary component between the touch panel and the noisy environment. This protection circuit includes a detection block that monitors noise levels and a protection block that activates protective measures when noise exceeds thresholds, thereby mediating the interaction between the touch panel and harmful noise factors without requiring fundamental changes to the touch panel structure
Solution Approach 2:
The protection circuit implements preliminary anti-action by detecting noise interference before it causes signal saturation and erroneous touch detection. The detection block continuously monitors the environment and preemptively activates the protection mechanism when noise levels approach problematic thresholds, preventing the harmful effects from manifesting in the first place
2Adaptability or versatility
If RF signals with large amplitude are present in the mobile phone, then communication functionality is maintained, but the RF signals introduce noise that results in signal saturation and erroneous touch event detection
Solution Approach 1:
The protection circuit segments the touch panel system into distinct functional blocks: a detection block that monitors for RF signal-induced noise and a protection block that selectively activates protective measures. This segmentation allows the communication functionality to operate independently while the protection mechanism selectively intervenes only when RF signals cause problematic noise levels, preserving measurement precision without compromising communication adaptability
3Ease of manufacture
If a low-cost/low-quality charger is used to charge the battery device, then charging cost is reduced, but the charger introduces high common-mode noise that makes the touch controller operate abnormally
Solution Approach 1:
The protection circuit implements self-service by autonomously detecting the presence of high common-mode noise from the charger and automatically activating the protection mechanism without requiring user intervention. The detection block monitors power supply quality and the protection block selectively enables protective measures, allowing the system to adapt to low-cost chargers while maintaining touch controller reliability through self-diagnosis and self-protection
Data Source
AI summary
A protection circuit for a touch panel device includes a detection block and a protection block. The detection block is arranged for detecting occurrence of noise interference that affects touch event detection of the touch panel device, and asserting a protection signal when occurrence of the noise interference is detected. The protection block is arranged for enabling a protection mechanism for protecting the touch panel device from the noise interference when triggered by the asserted protection signal. Besides, a protection method for a touch panel device includes: detecting occurrence of noise interference that affects touch event detection of the touch panel device; and enabling a protection mechanism for protecting the touch panel device from the noise interference when occurrence of the noise interference is detected.