Touch Panel Channel-Specific Noise Compensation and Peak Avoidance
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Solution Overview
Problem
Display noise affects touch-sensing panels unevenly, leading to insufficient or excessive noise compensation across different channels, causing errors in data decoding, especially when noise peaks occur during reset periods.
Innovation Solution
A noise compensation device and method that generate mutually different noise compensation signals for each channel of a touch-sensing panel, using a noise compensation signal generator and noise cancelling signal output circuit to provide noise-compensated reception signals, and a noise avoiding method that generates a sensing drive signal with a different frequency from the display drive signal to avoid noise peak areas by modifying the masking period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If uniform noise compensation is applied to all channels, then the device complexity is reduced, but the noise compensation precision deteriorates because display noise influences each channel differently
Solution Approach 1:
The patent divides the touch-sensing panel into multiple channels (first to Nth channels) and generates mutually different noise compensation signals for each channel. This segmentation allows each channel to receive customized noise compensation tailored to its specific noise characteristics, resolving the contradiction between device complexity and noise compensation precision.
Solution Approach 2:
The patent applies local quality by generating channel-specific noise compensation signals that are customized for each channel's noise profile. Instead of uniform compensation, each channel receives compensation signals adapted to its local noise conditions, improving overall noise compensation precision while maintaining manageable device complexity through systematic signal generation.
2Productivity
If data sampling is performed during reset period, then the productivity is improved, but the measurement precision deteriorates when noise peak occurs during reset period causing errors in data decoding
Solution Approach 1:
The patent applies preliminary action by generating noise compensation signals in advance and applying them to the reception signals before data sampling and decoding. This pre-compensation approach ensures that when data sampling occurs during the reset period, the noise peaks have already been compensated for, preventing decoding errors while maintaining sampling efficiency.
Solution Approach 2:
The patent implements preliminary anti-action by generating noise compensation signals that counteract the expected noise peaks before they affect the data sampling process. By applying compensation signals in advance that are specifically designed to offset noise interference, the system protects data decoding accuracy while allowing continuous productivity during reset period sampling.
Data Source
AI summary
The present inventive concepts relate to a noise compensation device and method of a touch-sensing panel, and to a noise avoiding device and method. The noise compensation device of a touch-sensing device according to some example embodiments includes: a noise compensation signal generator configured to generate mutually different noise compensation signals for at least portions of first to Nth channels included in the touch-sensing panel; and a noise cancelling signal output circuit configured to generate noise-compensated reception signals based on the mutually different noise compensation signals and provide the noise-compensated reception signals to each of at least two channels among the first to Nth channels, wherein N is an integer two or greater.