Touch Screen Scale Display for Pinch Zoom Visibility
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Solution Overview
Problem
Users find it difficult to instantly recognize the enlargement or reduction factor when performing operations with two fingers on a touch panel, as the scale is conventionally displayed in a position that requires gaze movement, making it cumbersome.
Innovation Solution
A method and device utilizing multi-touch detection sensors and cameras to display the enlargement or reduction factor near the operating fingers, positioning it outside their shadow, and recognizing hand operations to ensure visibility during pinching actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the scale is displayed at the conventional position on the map screen, then the map display layout is simple, but the user cannot instantly recognize the enlargement or reduction factor without moving gaze
Solution Approach 1:
The scale display is moved from the conventional two-dimensional map plane to a new dimension by displaying it in the space between the user's fingers during pinching operation. This spatial repositioning allows the scale to be viewed without moving gaze from the fingers, instantly showing the enlargement or reduction factor.
Solution Approach 2:
The space between the user's fingers acts as an intermediary display area for the scale information. This intermediary space serves as a bridge between the user's hand operation and the map display, providing immediate visual feedback about the current scale without requiring the user to look away from their fingers.
2Loss of information
If the enlargement factor is displayed near the operating fingers, then the user can instantly recognize the scale, but the display may be obscured by the shadow of the fingers
Solution Approach 1:
The system detects whether the user is performing a right-hand or left-hand pinching operation and asymmetrically positions the scale display accordingly. For right-hand operations, the scale is displayed on the left side of the finger space, and for left-hand operations, it is displayed on the right side, ensuring the scale is always positioned in the lighter area not obscured by finger shadows.
Solution Approach 2:
The scale display position is dynamically adjusted based on real-time detection of which hand is being used for the pinching operation. The display location changes adaptively between left and right positions depending on the detected hand, optimizing visibility conditions for different user gestures.
3Ease of operation
If a camera is added to detect hand operations and determine display position, then the scale visibility is optimized, but the device complexity increases
Solution Approach 1:
The camera module serves multiple functions: it captures the user's hand operation, determines whether it is a right-hand or left-hand pinch, and provides this information to the display control system. By making the camera multi-functional, the patent minimizes the need for additional separate sensors or detectors, thereby reducing overall device complexity while achieving optimized scale visibility.
Solution Approach 2:
The system uses the camera to automatically detect and analyze the user's hand gesture, then autonomously determines the optimal scale display position without requiring user input or manual adjustment. The system self-adjusts the display based on the detected operation, reducing the need for complex user interfaces or additional control mechanisms.
Data Source
AI summary
A method for displaying a scale for an enlargement and reduction operation on a touch screen includes detecting, using a multi-touch detection sensor, a plurality of touches by a user on the touch screen, and detecting an enlarging operation or a reducing operation caused by the user applying two operating fingers to the touch screen. An enlargement factor or a reduction factor is displayed on the touch screen at a position near the two operating fingers of the user.