Scroll Control Device for Touch Screen Direction Locking
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Solution Overview
Problem
Users often find it difficult to scroll screens on touch devices smoothly, as their finger movements can inadvertently change the scrolling direction, leading to frustration when trying to scroll vertically or horizontally.
Innovation Solution
A scroll control device that uses threshold values to determine the direction of scrolling based on touch point coordinates, locking or unlocking scrolling in specific directions to ensure accurate horizontal, vertical, or two-dimensional scrolling by adjusting threshold values dynamically during the drag operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the user touches and drags the touch screen to scroll, then the screen can be scrolled, but the scrolling direction may change unintentionally due to finger migration
Solution Approach 1:
The patent segments the touch screen into multiple detection zones (first region and second region) with different scroll response characteristics. The first region allows free scrolling in any direction, while the second region restricts scrolling to prevent unintended direction changes. This segmentation resolves the contradiction by providing different operational modes in different spatial zones.
Solution Approach 2:
Different regions of the touch screen are assigned different scroll control properties. The first region has permissive scroll control for intuitive operation, while the second region has restrictive scroll control for precision. This local differentiation allows the system to provide both ease of operation and direction accuracy in appropriate contexts.
2Measurement precision
If threshold values for scroll lock are fixed, then the scroll direction can be controlled, but the control may be too restrictive or too permissive for different drag speeds
Solution Approach 1:
The patent makes the threshold values dynamic by adjusting them based on the drag speed. When the drag speed exceeds a predetermined threshold, the system increases the threshold values to allow greater finger migration without triggering unintended scroll direction changes. This dynamic adjustment resolves the contradiction by adapting the control sensitivity to the user's operating style.
Solution Approach 2:
The system changes the threshold parameters based on detected drag conditions. When quick drag is detected, the threshold values are increased to accommodate the faster movement. This parameter adjustment allows the same scroll control mechanism to work effectively for both slow and fast drag operations.
Data Source
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Figure 3A
AI summary
When a horizontal-coordinate value or a vertical-coordinate value of a current touch point with reference to a point of origin defined at a touch-start point at which a drag operation on a touch screen starts is less than a threshold value, an X-direction movement amount reset unit (42) or a Y-direction movement amount reset unit (44) resets an amount of horizontal movement or an amount of vertical movement in the drag operation to zero. A scroll control unit (40) scrolls the screen in accordance with the amount of horizontal movement and the amount of vertical movement as processed by the X-direction movement amount reset unit (42) and the Y-direction movement amount reset unit (44).