Touch Display Scroll Position Deviation Control
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Solution Overview
Problem
In electronic devices, when scrolling through a list of items on a screen, selecting an item at the end can cause confusion as the displayed selected item moves due to scrolling, leading to a deviation between the touched position and the selected item, making it unclear if the correct item has been selected.
Innovation Solution
A display control apparatus that detects touch operations and maintains the selected item's position until the touch is released, then scrolls to reveal additional items if the selected item is not at the end of the list, ensuring the user recognizes the correct selection without positional deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If scrolling is performed immediately after selecting an end item, then additional selectable items can be displayed, but the selected item's position deviates from the touch position causing user confusion
Solution Approach 1:
The system performs preliminary action by displaying a placeholder at the touched position before scrolling occurs. This placeholder preserves the visual indication of selection at the original touch location, allowing the user to understand that their touch was registered correctly even though the displayed items will shift during scrolling
Solution Approach 2:
A placeholder object acts as an intermediary between the touched item and the scrolling operation. The placeholder maintains the visual connection between the user's touch and the selected item, serving as a mediator that prevents confusion while allowing the scrolling to reveal additional items
2Loss of information
If the touched item is displayed in selected state immediately, then user feedback is provided, but scrolling afterward causes positional deviation between touch and selection
Solution Approach 1:
The placeholder is created in advance at the touched position to preserve selection feedback. This preliminary action ensures that the user receives immediate visual confirmation of their selection while preventing the confusion that would arise from subsequent positional changes during scrolling
Solution Approach 2:
The placeholder is a visual copy or representation of the selected item's selection state. It replicates the visual indication (such as highlighting or selection marking) at the original touch position, allowing the user to see the selection feedback remains associated with their touched item even as other items scroll into view
Data Source
AI summary
A display control apparatus enables a user to easily recognize that a selectable item is present in addition to a displayed item and to recognize without being confused that a target item has been touched. The apparatus is capable of displaying an item group including a plurality of items which are a part of all items, when a touch is detected on any item in the item group displayed on the display unit, displaying the touched item in a selected state, and if release of the touch is detected, and if the selected item is an end item among the displayed group of items but is not an end item among all the items, moving the displayed item among all the items in a direction for displaying an item that is not being displayed in the direction of an end based on the release of the touch.