Back Surface Touch Sensor Vector Analysis for Accurate Scrolling
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Solution Overview
Problem
When operating an electronic device with a touch sensor on the back surface, users often inadvertently cause the screen to move diagonally instead of longitudinally or laterally due to the diagonal movement of their index finger, making agile scrolling operations difficult.
Innovation Solution
The electronic device includes a controller that analyzes the vector components of a slide operation on the back surface touch sensor and slides the screen in the direction of the larger vector component, ensuring that the screen moves longitudinally or laterally as intended, using the entire vector of the slide operation as the displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a touch sensor is added on the back surface to enable one-handed operation, then ease of operation is improved, but the screen may move diagonally instead of longitudinally or laterally due to natural finger movement patterns
Solution Approach 1:
The controller changes the interpretation parameters of touch input by analyzing vector components and comparing longitudinal vs lateral magnitudes. This transforms the diagonal finger movement into accurate longitudinal or lateral screen scrolling by selectively responding to the dominant component of the input vector.
Solution Approach 2:
The controller acts as an intermediary between the back surface touch sensor and the screen display. It mediates the diagonal finger movement by decomposing the input vector into components and translating it into the intended scrolling direction based on magnitude comparison, thus reconciling natural finger movement with precise screen navigation.
2Ease of operation
If the user slides the index finger diagonally on the back surface touch sensor, then ease of operation is maintained, but the screen scrolling direction becomes inaccurate
Solution Approach 1:
The system changes how touch input parameters are interpreted by the controller. Instead of directly mapping diagonal finger movement to diagonal screen movement, the controller analyzes the vector components and determines the primary direction based on magnitude comparison, thereby converting casual diagonal gestures into precise longitudinal or lateral scrolling.
3Measurement precision
If the touch sensor responds to all vector components of the slide operation, then measurement precision is improved, but the screen may still move diagonally which is not the intended scrolling direction
Solution Approach 1:
The controller changes the response parameters by selectively amplifying or ignoring certain vector components based on magnitude comparison. When the longitudinal component is larger, the system responds only to longitudinal movement for scrolling, and similarly for lateral movement, thus aligning the screen response with the user's intended scrolling direction while maintaining accurate detection of the slide operation.
Data Source
AI summary
An electronic device (1) includes touch sensors (12, 13) on the front surface and on the back surface and a controller that slides the currently displayed screen, upon detecting performance of a slide operation on the touch sensor (13) on the back surface, by sliding the screen in only the direction of the larger vector component between the longitudinal component and the lateral component of the vector of the slide operation.