Dynamic Auxiliary Line for Projector Drawing Alignment
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Solution Overview
Problem
Existing image display devices, such as projectors, face challenges in accurately detecting and displaying handwritten characters due to misalignment and obstruction issues with guide lines, which hinder efficient drawing on projected images.
Innovation Solution
An image display device with a position detection unit, drawing unit, auxiliary line display unit, and mode setting unit that displays an auxiliary line during drawing and erases it at the end, allowing for precise and unobstructed drawing by projecting auxiliary lines that move with the indicator and extend as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a guide line is displayed from the ends of the display section to assist character drawing, then character alignment is improved, but the guide line obstructs other drawn images and reduces visibility of content
Solution Approach 1:
The auxiliary line changes from a static full-screen display to a dynamic element that moves with the indicator position and adjusts its length based on drawing progress. The line is displayed only within the necessary range rather than extending to display section ends, reducing obstruction while maintaining alignment guidance functionality
Solution Approach 2:
The auxiliary line is displayed locally only in the region where drawing is actively occurring, rather than globally across the entire display section. This localized display reduces interference with other content while providing alignment assistance where needed
2Ease of operation
If a reference character component is determined from a drawn image to generate a guide line, then character input direction can be guided, but detection errors occur depending on character shape
Solution Approach 1:
The system continuously monitors the indicator position during drawing and provides real-time feedback through the moving auxiliary line, rather than relying on one-time reference character detection. This continuous feedback mechanism avoids detection errors by basing guidance on actual drawing progress rather than interpreted character shapes
Solution Approach 2:
The auxiliary line generation is based on the actual drawing action and indicator movement rather than requiring external reference character input. The system uses the drawing process itself to determine when and where to display the line, making the guidance self-adapting to the user's intent
3Measurement precision
If an auxiliary line is displayed continuously to assist drawing, then drawing alignment is improved, but the line becomes unnecessary obstruction after drawing ends
Solution Approach 1:
The auxiliary line is displayed periodically only during the active drawing phase and automatically hidden when drawing ends or pauses. This periodic display pattern eliminates continuous obstruction while providing alignment assistance precisely when needed during the drawing operation
Data Source
AI summary
As a start operation for an auxiliary line mode is accepted, the projector displays an auxiliary line. When an auxiliary line mode end operation is accepted or a non-drawing state exceeds a certain time, the projector erases the auxiliary line and ends the auxiliary line mode.