Display Control Apparatus Touch Operation History
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Solution Overview
Problem
Existing display control methods do not allow users to independently select whether to enlarge or reduce a display object based on touch position, leading to unintended display control outcomes.
Innovation Solution
A display control apparatus and method that detects touch operations and switches criteria for enlargement or reduction based on whether a touch operation was performed before a multi-touch operation, allowing enlargement or reduction with reference to either the touch positions or a fixed position on the screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If enlargement/reduction is always based on touch position, then user can precisely control where to enlarge/reduce, but user cannot enlarge/reduce independently from touch position when desired
Solution Approach 1:
The patent implements dynamic switching between two enlargement/reduction modes based on touch operation history. The system transitions from a static single-mode approach to a dynamic multi-mode system that adapts to user intent. When a touch operation is detected before a multi-touch operation, the system switches to reference a fixed position (center or edge) rather than the touch position, enabling versatile display control that adapts to different user scenarios.
2Adaptability or versatility
If enlargement/reduction criterion is determined by pre-touch operation state, then system can adapt to user intent, but user loses ability to select criterion independently
Solution Approach 1:
The system automatically detects user intent through touch operation history and self-adjusts the enlargement/reduction criterion without requiring explicit user selection. By monitoring whether a touch operation occurred before the multi-touch operation, the system autonomously determines whether to reference touch positions or fixed positions, providing adaptive behavior that serves user needs without adding operational complexity.
3Ease of operation
If multi-touch operation always references touch positions, then enlargement/reduction occurs at user-touched location, but user cannot achieve center-based or edge-based enlargement/reduction
Solution Approach 1:
The patent segments the enlargement/reduction functionality into two distinct modes: touch-position-based mode and fixed-position-based mode. This segmentation allows the system to reference either touch positions or fixed positions (center/edge) depending on the detected touch operation history, providing users with both intuitive touch-based control and structured fixed-position control options.
Data Source
AI summary
A display control apparatus performs control, when a multi-touch operation is detected and a predetermined touch move operation is not detected, such that a display object displayed on the display unit is enlarged or reduced in accordance with the multi-touch operation with reference to a first position that is based on the positions at which the multi-touch operation is performed, and performs control, when a predetermined touch move operation and a multi-touch operation are detected, such that the display object displayed on the display unit is enlarged or reduced in accordance with the multi-touch operation with reference to a second position that is not based on the positions at which the multi-touch operation is performed.