Touch Input Validation via State Transition Detection
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Solution Overview
Problem
Touch input devices often experience erroneous operations due to unintentional touches on the screen, especially when supporting the device, as it is difficult to distinguish between touch points for device support and actual operation inputs, leading to recognition of extra or invalid touch inputs.
Innovation Solution
An information processing apparatus with a detection unit, determination unit, and recognition unit that identifies and invalidates unintended touch points by determining the validity of touch points based on changes in the number of detected points and their duration or movement, ensuring only intended inputs are recognized.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the screen occupies the most part of the apparatus to maximize display area, then the display area is improved, but unintentional touches occur more frequently when the user holds the device
Solution Approach 1:
The patent changes the parameter of touch point identification from static coordinate detection to dynamic state transition detection. By monitoring whether touch points remain unchanged across multiple detection cycles, the system distinguishes between intentional touches (which move or are released) and unintentional holds (which remain static), thereby resolving the contradiction between large display area and unintentional touch reduction.
2Adaptability or versatility
If multiple touching operations are enabled to increase functionality, then the versatility is improved, but erroneous operations occur more frequently due to mistouches
Solution Approach 1:
The patent applies preliminary action by detecting and identifying unintentional touch points before they can trigger erroneous operations. The system continuously monitors touch points across multiple detection cycles and pre-identifies static touch points as unintentional, preventing them from being processed as valid input commands. This allows multiple touching operations to function correctly while filtering out mistouches.
3Measurement precision
If touch points are detected based on contact region shape to distinguish fingers, then the measurement precision is improved, but it becomes difficult to distinguish between support touches and operation touches
Solution Approach 1:
The patent introduces a new dimension of detection by adding the time dimension to touch point analysis. Instead of relying solely on spatial characteristics (contact region shape), the system detects whether touch points remain unchanged across multiple detection cycles. This temporal dimension provides an additional criterion for distinguishing between support touches (static) and operation touches (dynamic), complementing the existing spatial analysis.
Data Source
AI summary
In a case where a plurality of touch points touching on a touch panel is detected, a touch point changed from a previous state among the plurality of touch points is determined to be valid, whether a touch point not changed is valid is determined, and information regarding the touch point determined to be valid is recognized as an input.