Ghost-Free Sensor Array Scanning via Diagonal Sensing Lines
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Solution Overview
Problem
Existing methods for determining the location of actuated sensors on a contact-sensitive surface often suffer from the 'ghost key' problem, where incorrect locations are detected, leading to inaccuracies in identifying actual contacts.
Innovation Solution
The implementation of a scanning method using three sets of sensing lines (x-axis, y-axis, and a third direction) coupled with a line decoder, candidate generator, and validity checker to accurately determine actuated sensors by generating a list of possible candidates and removing ghost sensors through validation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional two-set sensing line scanning method is used, then the device complexity is low, but the measurement precision deteriorates due to ghost key detection errors
Solution Approach 1:
The patent introduces a third sensing line dimension (diagonal direction) to resolve ambiguities in sensor location detection. By adding this additional dimensional perspective, the system can distinguish between actual contact points and ghost key locations, thereby improving measurement precision without significantly increasing overall system complexity
Solution Approach 2:
The patent introduces a validity checker unit as an intermediary component that processes the sensing line outputs. This mediator validates detected sensor locations by cross-referencing multiple sensing line data, eliminating ghost key errors while maintaining a relatively simple device architecture
2Reliability
If additional sensing lines are added to eliminate ghost keys, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
By adding sensing lines in a third diagonal direction, the system creates additional validation perspectives. This dimensional enhancement improves reliability by enabling cross-verification of detected contacts, while the structured addition of only necessary sensing lines prevents excessive complexity increase
Solution Approach 2:
The validity checker unit implements a feedback mechanism that uses outputs from multiple sensing line sets to validate and correct detection results. This feedback loop improves reliability by continuously verifying sensor locations against multiple data sources, while the feedback-based validation logic keeps the control structure manageable
Data Source
AI summary
Aspects of the invention relate to a method and apparatus for scanning an array of sensors. More particularly, the invention is directed towards scanning an array of sensors to accurately determine actuated sensors on a contact-sensitive surface. In one embodiment, three sets of sensing lines can be incorporated into the sensing area for ghost-free detection of up to two keys. Further in other embodiments, n sets of sensing lines can be incorporated into the sensing area for ghost free detection of up to n−1 keys.