Touch Screen Shift Pointing Callout for Occlusion Errors
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Solution Overview
Problem
Touch input on devices like PDAs and UMPCs is inefficient and error-prone due to occlusion of small targets by the user's finger, leading to ambiguity in selection points and increased error rates.
Innovation Solution
A shift pointing technique that displays a callout and pointer in a non-occluded area of the screen, allowing users to visually guide their finger to select small targets by moving the pointer over the representation of the occluded area, reducing occlusion-related errors and ambiguity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If touch input is used to select small targets on a touch screen, then ease of operation is improved (no stylus needed), but measurement precision deteriorates (occlusion causes ambiguity in selection point)
Solution Approach 1:
The patent introduces a second visual dimension by displaying a callout that shows a representation of the occluded screen area. This allows users to see the selection point position in a different visual space (the callout) while maintaining the original touch interaction model, effectively adding a dimensional layer to resolve the occlusion problem.
Solution Approach 2:
The callout acts as an intermediary element that mediates between the user's finger (selection entity) and the small target on the screen. It provides visual feedback about the selection point position without requiring the user to see the actual contact point on the occluded screen area.
2Measurement precision
If a stylus is used to select targets on a touch screen, then measurement precision is improved (clear selection point), but ease of operation deteriorates (requires retrieving stylus, inconvenient for one-handed operation)
Solution Approach 1:
The finger itself serves dual purposes: it is both the selection entity that contacts the screen and the visual indicator of selection. The system processes the touch input and generates visual feedback (callout with pointer) that shows where the finger is selecting, making the finger self-sufficient as both tool and indicator.
Solution Approach 2:
The patent implements visual feedback by displaying a callout that shows a representation of the occluded area with a pointer indicating the current selection point. This feedback loop allows users to see the consequence of their touch action in real-time, enabling precise selection without a stylus.
3Ease of operation
If the screen area is increased to reduce occlusion, then ease of operation is improved (better visibility), but device complexity increases (requires additional display mechanisms)
Solution Approach 1:
Instead of physically expanding the screen or adding mechanical components, the patent uses software-based visualization to create a virtual representation of the occluded area in a different visual dimension (the callout window), achieving enhanced visibility without physical expansion.
Solution Approach 2:
The patent creates a visual copy or representation of the occluded screen area within the callout. This copy shows what is hidden under the finger and indicates the selection point position, providing visibility without requiring additional physical screen real estate or complex display mechanisms.
Data Source
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Figure 4(a)~5(b)
AI summary
Techniques and technologies are provided which can allow for touch input with a touch screen device. In response to an attempt to select a target displayed on a screen, a callout can be rendered in a non-occluded area of the screen. The callout includes a representation of the area of the screen that is occluded by a selection entity when the attempt to select the target is made.