Asymmetric Multi-Row Touch Panel Scanning for Signal Noise
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Solution Overview
Problem
Conventional touch screen devices face limitations such as high current drain, poor response time, especially under fast motion, and performance issues in extreme conditions with electromagnetic interference and contaminants.
Innovation Solution
The implementation of an asymmetric multi-row touch panel scanning method, which includes orthogonal multi-row stimulation logic and asymmetric scanning logic, to improve signal-to-noise ratio and reduce power consumption by scanning multiple rows simultaneously and adaptively focusing on regions of interest.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional row-by-row scanning is used, then device complexity is reduced, but signal-to-noise ratio deteriorates and response time increases
Solution Approach 1:
The touch panel is divided into multiple row groups that can be scanned simultaneously. Each row group contains multiple rows that are scanned in parallel using orthogonal signaling, allowing the system to process multiple regions of the panel at the same time without increasing overall complexity
Solution Approach 2:
The patent transitions from sequential row-by-row scanning to multi-dimensional parallel scanning by introducing orthogonal signaling across multiple rows simultaneously. This adds a temporal dimension to the scanning process, allowing multiple rows to be scanned in parallel without interfering with each other
2Measurement precision
If full panel scanning is performed continuously, then measurement precision is maintained, but power consumption increases
Solution Approach 1:
The scanning system dynamically adjusts which row groups are scanned based on detected touch events. When a touch is detected in one region, the system can reduce or skip scanning in other regions, adapting the scanning behavior to actual usage patterns and reducing unnecessary power consumption
Solution Approach 2:
The system uses periodic orthogonal signaling across multiple rows in a structured sequence, allowing efficient parallel scanning of row groups. This periodic multi-row scanning approach maintains measurement precision while reducing overall scanning time and power consumption compared to continuous full-panel scanning
3Speed
If conventional scanning is used, then device complexity is low, but response time deteriorates under fast motion
Solution Approach 1:
The scanning system is segmented into multiple independent row groups that can be scanned in parallel. This segmentation allows the system to detect touches in different regions simultaneously, reducing the overall response time for fast motion detection without requiring a complete redesign of the scanning architecture
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 enhances the signal-to-noise ratio and reduces power consumption while maintaining or improving response time, even under challenging conditions, by efficiently scanning multiple rows and prioritizing areas of interest.
Implementation Method 1
capacitive touch panel scanning
Data Source
AI summary
Asymmetric scanning logic implements asymmetric panel scanning by scanning some rows on a touch panel more frequently than other rows. Note that although an entire row at a time may be driven, if only particular pixels in the row are of interest (e.g., included in any region of interest for focused asymmetric scanning), then circuitry may power down the receivers for the columns in which the pixels exist to save power. The asymmetric scanning logic facilitates focused attention to specific areas of interest on the touch panel, to compensate, for example, for high noise or low signal strength in those areas of interest.