Touch Radius Detection for Finger Selection Accuracy
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Solution Overview
Problem
Conventional touch-screen interfaces on mobile and handheld devices are error-prone for users attempting to click on small links due to the difficulty in accurately aiming with a finger or stylus, leading to incorrect or missed interactions.
Innovation Solution
A system that determines a 'touch radius' around the click point on a touch-sensitive display, scans for interactive elements within this area, and expands or animates potential targets to resolve ambiguity, allowing users to more accurately select intended elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional touch-screen interfaces detect click at a single point, then the device structure remains simple, but the accuracy of element selection deteriorates due to finger size constraints
Solution Approach 1:
The patent segments the touch detection process into multiple stages: initial single-point detection, followed by expansion to a touch radius area, then scanning for interactive elements within that area. This segmentation allows the system to maintain simple initial detection while adding precision through subsequent processing steps.
Solution Approach 2:
The patent transitions from zero-dimensional point detection to two-dimensional area scanning by expanding the touch point into a touch radius. This dimensional change allows the system to account for finger size and improve selection accuracy by detecting elements within the expanded area rather than relying solely on the exact contact point.
2Reliability
If the touch radius area is expanded to include more interactive elements, then the margin of error for finger touch improves, but the complexity of determining which element was intended increases
Solution Approach 1:
The patent performs preliminary actions by expanding the touch point to a touch radius and pre-scanning for interactive elements before the user completes their selection. This preliminary identification of potential target elements reduces the complexity of the final selection process by narrowing down options in advance.
Solution Approach 2:
The system provides feedback by identifying and presenting potential target elements to the user after the initial touch but before final selection. This feedback mechanism allows the user to confirm or adjust their selection, improving reliability while managing complexity through iterative refinement rather than single-step decision-making.
3Productivity
If small interactive elements are displayed to maximize screen space, then the productivity of information display improves, but the ease of operation deteriorates due to difficulty in accurate finger aiming
Solution Approach 1:
The patent compensates for small element size by expanding the touch detection from a point to a two-dimensional radius area. This allows elements to remain small for efficient screen space utilization while the expanded detection area provides a larger effective target for finger contact, maintaining ease of operation.
Solution Approach 2:
The system provides a cushioning effect by creating a touch radius buffer zone around the detected finger contact point. This buffer acts as a margin of error that protects against missed clicks on small elements, allowing users to operate easily without precise aiming while maintaining high screen space utilization.
Data Source
AI summary
A method and apparatus for selecting an item on a display screen with a touch interface by touching the display screen with a finger or stylus-type device. The touch point on the screen is detected, and a touch radius is established with respect to the touch point. When selectable items are detected to be displayed at least partially within the touch radius of the touch point, they are partially activated by altering the manner in which they are displayed. Upon detection of another touch point selecting a partially activated item, that item is fully activated and the other partially activated items are deactivated.