Dynamic Selection Zone Resizing for Touch Input Accuracy
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Solution Overview
Problem
Users face difficulties in interacting with touch-sensitive displays due to the limited resolution caused by the size of their fingertips, leading to inaccuracies in selecting small keys, especially on devices with small displays and for individuals with larger hands.
Innovation Solution
A processor adjusts the size of selection zones on a touch-sensitive display based on the likelihood of their being selected next, enlarging zones for likely selections and decreasing adjacent zones to prevent overlap and improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the spatial resolution of the touch-sensitive display is increased by making keys smaller, then more keys can be displayed on the screen, but the accuracy of touch selection decreases because the fingertip size limits the effective resolution
Solution Approach 1:
The patent applies local quality by making selection zones of different sizes based on the likelihood of selection. Frequently selected indicia (like space bar or common letters) have larger selection zones, while less frequently selected indicia have smaller zones. This allows the interface to adapt to user behavior patterns, improving accuracy for common inputs while maintaining compact layout for less common keys.
Solution Approach 2:
The selection zones are dynamically adjusted based on the context of previous selections. The system analyzes the sequence of selected indicia and modifies selection zone sizes in real-time based on predictive models of what the user is likely to select next. This dynamic adaptation resolves the contradiction by making the interface responsive to usage patterns rather than static.
2Measurement precision
If the size of selection zones is increased to improve touch selection accuracy, then fingertip tolerance is improved, but the number of keys that can be displayed on the screen decreases
Solution Approach 1:
Instead of uniformly increasing all selection zones, the patent applies local quality by selectively enlarging only those zones corresponding to frequently selected indicia. This allows the system to improve touch selection accuracy for the most critical keys while keeping other zones compact, thereby maintaining a high density of displayable keys overall.
Solution Approach 2:
The system changes the parameter of selection zone size based on the contextual state of the interface. By analyzing usage patterns and predictive models, the system adjusts zone sizes dynamically, increasing size only when and where it improves accuracy, rather than uniformly across all keys. This resolves the contradiction by making size adjustment conditional and context-dependent.
3Ease of manufacture
If uniform selection zones are used for all indicia, then the interface is simple to implement, but accuracy decreases for frequently selected keys that require larger target areas
Solution Approach 1:
The patent moves from uniform selection zones to locally optimized zones where each indicium's selection zone size is tailored to its selection frequency and importance. Frequently selected keys like space bar, enter, or common letters receive larger zones, while less frequent keys have smaller zones. This local differentiation improves accuracy for critical keys while maintaining reasonable complexity through automated analysis of usage patterns.
Solution Approach 2:
The system implements self-service by automatically analyzing user interaction patterns and autonomously adjusting selection zone sizes without requiring manual configuration. The interface monitors selection sequences, builds predictive models, and dynamically modifies zone sizes based on observed behavior, making the system adaptive to individual user needs while maintaining implementation simplicity through automation.
Data Source
AI summary
An electronic device is disclosed for use with a touch-sensitive display. The electronic device includes a processor that displays indicia on the touch-sensitive display that can be touch selected by a user, and defines a size and location of a plurality of selection zones on the touch-sensitive display that are each associated with different ones of the indicia. The processor identifies a first one of the selection zones that has been selected by the user on the touch-sensitive display, and outputs a first one of the indicia that is associated with the first selection zone. The processor changes the size of a second one of the selection zones in response to it being associated with a second one of the indicia that is more likely to be selected next following selection of the first selection zone associated with the first indicia than at least another one of the selection zones. Related methods of operating an electronic device are disclosed.