Touch Screen Pointer Offset Control for Precise Selection
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Solution Overview
Problem
In small-footprint devices like payment terminals, the imprecision of using a finger to select objects on a touch screen leads to frequent selection errors due to the finger obscuring the target area and lack of precise pointing tools, making it difficult to distinguish between neighboring objects.
Innovation Solution
A method that adjusts the direction and offset distance between the pointer and the finger's position on the screen, allowing the pointer to be configured for precise control without requiring additional hardware, using techniques such as measuring finger separation distance, angle adjustments, or common finger direction detection to assign an offset direction, enabling intuitive and ergonomic operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the touch screen is made small to reduce device footprint, then device size is reduced, but pointing precision deteriorates because the finger contact surface becomes comparable to or larger than the displayed objects
Solution Approach 1:
The patent introduces a pointer as an intermediary element between the user's finger and the target object on the screen. The pointer's position is controlled by finger movement, but the pointer itself (with its distinctive shape and visible indication point) provides precise targeting capability that the finger alone cannot achieve. This mediator resolves the contradiction by decoupling the large finger contact surface from the need for precise object selection.
Solution Approach 2:
The patent segments the interaction into two distinct components: the control element (finger) and the indication element (pointer). The finger provides coarse control and visibility, while the pointer provides fine-grained precision. This segmentation allows the system to maintain both the large contact area needed for ease of use and the precise pointing capability needed for small screens.
2Measurement precision
If the finger is moved closer to the screen to improve contact precision, then control precision improves, but the finger obscures the target area and causes selection errors
Solution Approach 1:
The pointer serves as a visual intermediary that indicates the target location without requiring the finger to physically cover it. The user can position the finger for comfortable contact while the pointer visually represents the precise targeting point, eliminating the obscuration problem while maintaining control precision.
Solution Approach 2:
The pointer creates a visual copy or representation of the intended contact point on the screen. Instead of relying on the physical finger position alone, the system projects a visual indicator (the pointer) that shows exactly where the user intends to interact, allowing the user to see the target before contact is made.
3Measurement precision
If offset control is added to improve pointing precision, then selection accuracy improves, but system complexity increases due to additional control mechanisms
Solution Approach 1:
The system uses the user's existing finger movements to automatically control the pointer position and offset adjustments. The user's natural gestures (such as spreading or closing fingers) directly translate to pointer control without requiring separate control mechanisms. This self-service approach maintains precision while avoiding additional complexity.
Solution Approach 2:
The touch screen serves multiple functions: it detects finger position for basic pointing, detects finger movement for pointer control, and detects finger configuration (such as distance between fingers) for offset adjustment. This multi-functionality allows the system to achieve precise offset control using the same input device without adding separate control mechanisms.
Data Source
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AI summary
The invention relates to a method for controlling a pointer (PNT) having a position determined by the position of at least one end of a member (F1) on a touch screen (TSCR). According to the invention, an offset (DIST, DDIR) is inserted between the position of the pointer (PTR) and that of the end of the member (F1) for driving the movements of the pointer (PNT) such that said end does not have to cover an object displayed on the screen in order to effectively select said object.