Display Control Maintaining Selected Menu Item Across Mode Transitions
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Solution Overview
Problem
Display control systems face user discomfort when switching between operation modes with varying menu items, as the previously selected item may change unintentionally, leading to an inconsistent user experience.
Innovation Solution
A display control apparatus that maintains the last selected item across mode transitions by using a setting unit to manage operation modes and a display control unit to select the corresponding menu item or default position based on previous selections, ensuring consistent display states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the menu displays the item selected in the previous operation mode, then the selection state is maintained across mode transitions, but the selected item may change unintentionally when menu items differ between modes, causing user discomfort
Solution Approach 1:
The system performs preliminary detection of whether the previously selected item exists in the current menu before displaying it. If the item does not exist, the system pre-determines to select a different item (such as the first item or a default item) rather than attempting to display the non-existent selected item, thereby preventing user confusion.
Solution Approach 2:
The control unit acts as an intermediary between the display control unit and the menu items. It mediates the selection process by detecting whether the previously selected item exists in the current menu and determining the appropriate item to display, thus preventing direct mapping of invalid selections.
2Adaptability or versatility
If the menu configuration allows different items to be displayed in different operation modes, then the menu is adapted to specific modes, but the previously selected item may not exist in the new mode's menu, causing unintended selection changes
Solution Approach 1:
The menu system dynamically adjusts the selected item based on the current operation mode. When switching modes, the control unit detects whether the previously selected item exists in the new mode's menu and dynamically determines the appropriate item to display, allowing the menu to adapt while maintaining stability in the selection state.
Solution Approach 2:
The system changes the parameter of the selected item based on the operation mode. When the previously selected item does not exist in the current mode's menu, the system changes the selected item parameter to a valid item in the current menu, such as the first item or a default item, thereby maintaining adaptability while preventing unintended selection changes.
3Ease of operation
If the system always selects a predetermined item (e.g., top item) in each menu display, then the selected state is consistent within each mode, but the user's previous selection is not remembered across mode transitions
Solution Approach 1:
The control unit uses feedback from the previous operation mode to determine the selected item in the current mode. It detects whether the previously selected item exists in the current menu and uses this feedback information to maintain the user's selection intent across mode transitions, thereby preventing information loss while maintaining consistency.
Data Source
AI summary
A system control unit displays, on a display unit, a menu screen corresponding to an operation mode designated through a mode change-over switch, and sets various conditions for the operation mode according to operation on an operation unit. The system control unit displays a predetermined menu item in a selected state on an initially opened menu screen. When a menu screen subjected to setting change is opened, the system control unit displays a menu item subjected to setting change last time in the selected state. A table indicating a menu item to be displayed in the selected state is stored in a nonvolatile memory.