Touch Panel Input Correction for Accidental Multi-Touch Rejection
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Solution Overview
Problem
Information processing terminals with touch panels often detect multi-touch operations incorrectly due to a user's finger holding the device inadvertently contacting the screen, leading to erroneous actions such as unintended zooming or scrolling.
Innovation Solution
A terminal apparatus that detects the contact positions and pressures of multiple points on the touch panel, determining the magnitude relationship between pressures to differentiate between intended multi-touch operations and erroneous contacts, thereby invalidating incorrect touch positions and preventing unwanted actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch panel detects multi-touch operations to enable gestures like zooming and scrolling, then the device's functionality and user interaction capability are improved, but erroneous operations occur when the user's finger holding the device inadvertently contacts the touch panel
Solution Approach 1:
The patent applies local quality by examining pressure distribution at different contact locations. The controller distinguishes between intentional multi-touch gestures and accidental contacts by analyzing the pressure characteristics at each contact point, allowing the system to selectively respond to valid gestures while ignoring erroneous inputs based on local pressure quality
Solution Approach 2:
The patent utilizes parameter changes by detecting and comparing pressure values as a distinguishing parameter. By monitoring pressure magnitude and changes at contact points, the system can differentiate between deliberate multi-touch operations and accidental contacts, enabling reliable gesture recognition while preventing erroneous operations
2Ease of operation
If the device accepts all detected touch contacts as valid inputs, then ease of operation is improved, but unintended actions occur due to accidental contacts from holding the device
Solution Approach 1:
The patent introduces pressure detection as an intermediary criterion between touch contact detection and operation execution. This intermediary layer filters out accidental contacts by evaluating pressure characteristics, allowing the system to maintain high responsiveness to valid inputs while blocking erroneous operations through the pressure-based mediation mechanism
Data Source
AI summary
A terminal apparatus includes a touch panel, a controller to detect a contact position of a first contact on the touch panel, a pressure applied by the first contact, a contact position of a second contact on the touch panel and a pressure applied by the second contact, and a processor executing a process that causes the terminal apparatus to determine whether or not the contact position of the first contact meets a predetermined condition, determine a magnitude relationship between the pressure applied by the first contact and the pressure applied by the second contact, and invalidate the contact position of the first contact when the contact position of the first contact meets the predetermined condition and it is determined that the pressure applied by the first contact is equal to or higher than the pressure applied by the second contact.