Touch Drawing Display Apparatus Erasing Erroneous Lines
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Solution Overview
Problem
Existing touch-input image display apparatuses face issues with distinguishing between drawing and non-drawing touch operations, leading to erroneous drawings and page switching, especially when multi-touch inputs are misinterpreted, causing unintended image changes and storage of unintended drawings.
Innovation Solution
A touch drawing display apparatus with a detecting unit that differentiates between drawing and non-drawing touch operations by analyzing the track formed by movement of detected positions, erasing erroneous lines and implementing a page switching mechanism using multi-touch sliding with threshold-based movement detection to prevent unintended page turns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the apparatus draws an image immediately upon detecting a touch operation, then drawing responsiveness is improved, but erroneous drawings occur when the touch operation is later determined to be for a different function
Solution Approach 1:
The apparatus performs preliminary drawing action immediately upon touch detection, then subsequently determines the actual operation type. If the operation is determined to be for a function other than drawing, the preliminary drawing is erased. This preliminary action allows immediate visual feedback while maintaining the ability to correct erroneous drawings.
Solution Approach 2:
The system implements a feedback mechanism where the drawn image is temporarily displayed immediately, then the operation type is determined based on additional touch information (such as multi-touch detection). Based on this feedback, the system either confirms the drawing or erases it if it was erroneous, thus resolving the contradiction between immediate responsiveness and accuracy.
2Productivity
If multi-touch flick operation is allocated to scrolling screen images, then navigation efficiency is improved, but drawing operations are disrupted when multi-touch is detected during drawing
Solution Approach 1:
The apparatus dynamically adjusts its interpretation of touch operations based on the current state. During drawing mode, single-touch operations are interpreted as drawing commands while multi-touch operations are interpreted as scrolling commands. This dynamic state-dependent interpretation allows both drawing and navigation functions to coexist without interference.
Solution Approach 2:
The system changes the operational parameters based on the number of touch points detected. When one touch point is detected, drawing parameters are applied; when multiple touch points are detected, scrolling parameters are applied. This parameter change based on touch configuration resolves the conflict between drawing and navigation operations.
3Measurement precision
If the apparatus monitors touch tracks for a prescribed time to determine flick operations, then accurate operation recognition is improved, but time lag occurs between touch and image display
Solution Approach 1:
The apparatus performs preliminary drawing action immediately upon touch detection without waiting for the full monitoring period. The drawing is displayed in real-time, and the operation type determination continues in the background. This separates the visual feedback timing from the operation determination timing, reducing perceived time lag while maintaining recognition accuracy.
Data Source
AI summary
An electronic blackboard includes a display panel and a touch-panel, draws a line corresponding to a track formed by movement of the touched position on the displayed image, and erases an erroneously drawn line corresponding to a track specifying an operation other than drawing. In another aspect, an electronic blackboard includes a touch screen, a scroll unit for scrolling an image on the display screen when positions of multi-touch move in one same direction, and a page switching unit for detecting, after detection of multi-touch input, that a finger is moved away, and executing a process of returning the image on the display screen to a state before scrolling or a process of switching the image by one page in accordance with the moving direction of multi-touch positions, depending on whether the amount of movement of touch inputs is equal to or smaller than a threshold value.