Touch Panel Noise Cancellation via Segmented Sensor Subtraction
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Solution Overview
Problem
Conventional touch panel systems are unable to reliably remove a wide variety of noises and often falsely recognize signals, particularly distinguishing between stylus, hand, and finger inputs, due to limitations in noise processing and signal differentiation.
Innovation Solution
A touch panel system with a main sensor section and a sub sensor section, where the sub sensor section detects noise signals and the subtracting section finds differences between adjacent sense lines to cancel noise, allowing for separate processing of partial and remainder regions, effectively removing noise and preventing false signal recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter section extracts AC signal components to remove noise, then noise removal is improved, but other types of noise cannot be removed
Solution Approach 1:
The sensor section is segmented into multiple independent sense lines (first sense line, second sense line, third sense line) that detect different noise components. Each sense line is dedicated to detecting specific noise types, allowing the system to handle multiple noise types simultaneously without interference.
Solution Approach 2:
A subtracting section acts as an intermediary that processes signals from multiple sense lines. It subtracts noise components detected by the sub sensor section from the main sensor section signals, effectively removing various noise types while preserving touch input signals.
2Measurement precision
If signal processing is performed to recognize finger and hand contacts, then touch recognition is improved, but false recognition occurs
Solution Approach 1:
The touch panel is divided into a main sensor section and a sub sensor section. The sub sensor section is specifically positioned to detect only noise signals, while the main sensor section detects both touch inputs and noise. This spatial segmentation allows the system to distinguish between actual touch inputs and noise-based false signals.
Solution Approach 2:
The subtracting section serves as an intermediary that receives signals from both sensor sections and processes them differently. By subtracting the noise component detected by the sub sensor section from the main sensor section signals, it eliminates false recognition while preserving accurate touch input detection.
Data Source
AI summary
The touch sensor system includes: a touch panel having a two-dimensional region made up of a hand placing region and a remainder region; a hand placing region processing section for carrying out a process related to the hand placing region in accordance with a hand placing region touch signal corresponding to a touch to the hand placing region; and a drawing input processing section for carrying out a drawing input process in accordance with a remainder region touch signal corresponding to a touch to the remainder region.