Projector Pen Z-Coordinate Mode Switching
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Solution Overview
Problem
Existing image display devices using touch pens on projected screens require users to navigate to a toolbar for operations, which can hide part of the screen and reduce user convenience.
Innovation Solution
An image display device with a position detection unit, distance detection unit, and processing unit that performs different operations based on the distance between the touch pen and the screen, allowing users to change drawing modes without a toolbar, such as switching between drawing and erasing, line color, and line thickness, by detecting the Z coordinate of the pen's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a tool bar is used for operations on the projected screen, then various operations can be performed, but part of the screen is hidden and user convenience is reduced
Solution Approach 1:
The patent introduces the depth dimension (Z-coordinate) as a new control parameter. Instead of using a 2D toolbar interface, the system uses the vertical position of the touch pen relative to the screen surface to select different drawing modes. This transforms the control interface from a spatial overlay (toolbar) to a spatial relationship (pen-to-screen distance), thereby maintaining full functionality while preserving screen visibility and improving user convenience.
2Adaptability or versatility
If a tool bar is displayed on the screen, then operations can be controlled, but the screen area available for display is reduced
Solution Approach 1:
The patent extracts the operation control function from the 2D screen plane and relocates it to the 3D spatial relationship between the touch pen and the screen. By detecting the Z-coordinate (distance from screen), the system eliminates the need for a visible toolbar overlay, thereby preserving the full display area while maintaining comprehensive operation control capabilities.
3Ease of operation
If distance-based operation modes are implemented, then various processing can be performed without toolbar, but distance detection accuracy is required
Solution Approach 1:
The patent implements a feedback mechanism where the detected Z-coordinate (distance from screen) is continuously monitored and used to dynamically switch between different drawing modes. The system provides feedback to the user through visual indication of the current mode and allows adjustment based on the detected distance, ensuring accurate and intuitive operation while maintaining the convenience of toolbarless interface.
Data Source
AI summary
A projector includes: a position detection unit which detects a designated position (XYZ coordinates) designated by a light pen; and a mode changing unit which determines that an operation button provided on the light pen is operated, and which changes a drawing mode if it is determined that the operation button is operated. The mode changing unit: changes the drawing tool if the Z coordinate of the designated position when it is determined that the operation button is operated is within a first distance range; changes the color of the pen if the Z coordinate of the designated position when it is determined that the operation button is operated is within a second distance range; and changes the thickness of the pen or the like if the Z coordinate of the designated position when it is determined that the operation button is operated is within a third distance range.