Active Pen Signal Interference Cancellation
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Solution Overview
Problem
Proximity sensor devices face interference issues from environmental sources, which degrade the accuracy of active pen signals used in electronic systems, affecting usability and reliability.
Innovation Solution
A processing system that includes a sensor module to receive noisy active pen signals and multiple interference signals from receivers, determines an estimated interference signal, and generates a filtered active pen signal by reducing interference using this estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If environmental interference is present in the sensing region, then the active pen signal can be received, but the accuracy of the active pen signal degrades
Solution Approach 1:
The patent introduces intermediary components (interference receivers and processing system) that mediate between the environmental interference and the active pen signal reception. The interference receivers detect interference signals, and the processing system generates an estimated interference signal that is subtracted from the noisy active pen signal, thereby eliminating the harmful interference while preserving the useful signal
Solution Approach 2:
The patent implements a feedback mechanism where the processing system continuously monitors interference signals through multiple interference receivers, generates an estimated interference signal, and subtracts it from the active pen signal in real-time. This closed-loop feedback approach dynamically compensates for environmental interference, maintaining signal accuracy despite varying interference conditions
2Measurement precision
If multiple interference receivers are added to reduce interference, then the accuracy of active pen signals improves, but the device complexity increases
Solution Approach 1:
The patent segments the interference detection function by using multiple interference receivers positioned at different locations around the sensing region. Each receiver independently monitors interference from different directions or sources, allowing the system to capture a comprehensive picture of the interference environment without requiring a single complex receiver
Solution Approach 2:
The processing system performs multiple functions: it processes signals from multiple interference receivers, generates the estimated interference signal, and subtracts it from the active pen signal. This multi-functional approach consolidates what could be separate components into a single integrated system, reducing overall device complexity while maintaining the benefits of multiple receivers
Data Source
AI summary
A processing system for reducing interference. The processing system includes: a sensor module configured to: receive a noisy active pen signal associated with an active pen from a panel receiver; and receive a plurality of interference signals from a plurality of interference receivers; and a determination module configured to: determine an estimated interference signal based on a subset of the plurality of interference signals; and generate a filtered active pen signal by reducing interference in the noisy active pen signal based on the estimated interference signal.