Touchscreen Navigation Scaling Factor for Single-Finger Reach
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Solution Overview
Problem
Navigating large touchscreen displays with a single anchored finger is challenging, as the finger's limited reach makes it difficult to access all areas of the screen, requiring clumsy grip changes or the use of a second hand.
Innovation Solution
A method that calculates a scaling factor based on the dimensions of the touchscreen display and the user's region of reach, allowing a single anchored finger to accurately navigate and interact with graphical elements by calculating a scaled position for a cursor, enabling precise control without the need for additional hand movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the touchscreen display size is increased, then the display area is improved, but the finger reach capability deteriorates
Solution Approach 1:
The patent introduces a cursor as an intermediary element that the user controls indirectly through touch inputs. The cursor acts as a mediator between the user's finger (which has limited reach) and the graphical elements on the large touchscreen display. Users can tap anywhere within their reach zone, and the system calculates and moves the cursor to the corresponding scaled position on the display, allowing access to the entire screen area without requiring direct finger reach to all locations.
Solution Approach 2:
The patent maps the two-dimensional touch input space (where the user can physically reach) to a different two-dimensional display space (the entire touchscreen area) through coordinate transformation. This dimensional mapping allows the limited physical reach area to control the full display area by establishing a mathematical relationship between the touch coordinates and display coordinates, effectively expanding the operational range beyond physical constraints.
2Area of stationary object
If the touchscreen display size is increased, then the display area is improved, but the navigation accuracy deteriorates
Solution Approach 1:
The patent dynamically adjusts the scaling factor parameter based on the user's reach characteristics and the display dimensions. By changing this parameter, the system optimizes the mapping relationship between touch inputs and cursor movements to maintain precision. The scaling factor acts as a tunable parameter that balances the trade-off between coverage area and positioning accuracy, allowing accurate navigation across the entire display area.
Solution Approach 2:
The system provides visual feedback by displaying the cursor position and its relationship to the user's touch inputs. This feedback loop allows users to see where their touches are registered on the display and adjust their inputs accordingly, improving navigation accuracy. The cursor serves as a visual indicator that confirms the mapping relationship between touch space and display space, enabling users to achieve precise control despite the scaled transformation.
3Ease of operation
If a single anchored finger is used for navigation, then the ease of operation is improved, but the reach capability deteriorates
Solution Approach 1:
The cursor serves as an intermediary that extends the effective reach of the anchored finger. Instead of requiring the finger to physically reach distant locations on the display, the user taps within their comfortable reach zone, and the cursor mediates by appearing and interacting at the corresponding location on the full display. This resolves the contradiction by allowing single-finger operation while achieving full-screen access through the mediating cursor mechanism.
Solution Approach 2:
The system creates a virtual copy of the interaction space on the display that is independent of the physical finger position. The cursor is a graphical representation that copies the function of direct finger contact, allowing users to interact with display elements without their finger needing to physically reach those locations. This virtual copy enables the anchored finger to control the entire display area through scaled coordinate mapping.
Data Source
AI summary
Methods, devices, and computer readable storage device for navigation of a touchscreen display include calculating a scaled position based on a scaling factor. The scaling factor is based on dimensions of a region of reach and dimensions of the touchscreen display.