Dual-Antenna Active Stylus Eraser for Precise Tilt-Based Erasure
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Solution Overview
Problem
Conventional pen-styluses lack advanced precision and functionality, particularly in determining the area of erasure on a display screen, and are often limited by compatibility issues with digitizer technologies.
Innovation Solution
An active pen-stylus with dual antennas in the front and rear portions processes user drawing and erasure data to calculate the tilt angle, allowing precise determination of the erasure area on the screen by employing a graphics display component that computes the tilt angle between the antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pen-stylus design is used, then device simplicity is maintained, but erasure precision and area determination capability are insufficient
Solution Approach 1:
The pen-stylus is segmented into distinct functional zones: a front writing tip and a rear eraser portion. The eraser portion further contains multiple antennas (first rear antenna and second rear antenna) that are spatially segmented to enable tilt angle detection. This segmentation allows each component to perform its specific function while collectively achieving precise erasure area determination without requiring complex integration.
Solution Approach 2:
The patent introduces tilt angle detection by utilizing the spatial orientation dimension. By placing antennas at different positions (front, rear, and varying lateral positions) along the pen-stylus, the system detects the tilt angle of the pen relative to the display surface. This adds a dimensional parameter (orientation/tilt) to the traditional 2D position detection, enabling precise determination of erasure area based on both position and angle.
2Measurement precision
If dual antenna system is implemented, then tilt angle detection precision is improved, but device complexity increases
Solution Approach 1:
The multiple antennas in the pen-stylus serve multiple functions: they enable tilt angle detection, provide position information, and facilitate communication with the display device. The same antenna structure that detects tilt also contributes to overall pen positioning and digital communication, reducing the need for separate dedicated components and mitigating the increase in device complexity.
3Adaptability or versatility
If precise erasure function is added, then functionality is enhanced, but compatibility issues with digitizer technology may arise
Solution Approach 1:
The system determines erasure area by calculating parameters (tilt angle) derived from antenna signal differences. By using parameter-based detection rather than fixed mechanical structures, the system can adapt to different digitizer technologies. The tilt angle calculation method can be implemented through software algorithms that work across various digitizer platforms, enhancing compatibility while maintaining precise erasure functionality.
Data Source
AI summary
Embodiments of the invention provide an improved structure and method for determining the tilt angle associated with the erasure component of an active pen-stylus relative to the display on a matching computing device by analysis of two different antenna signals associated with the erasure function and then employing this calculated tilt angle to determine an area of erasure on the display device associated with the active pen-stylus. Embodiments of the invention may effectively copy in an electronic eraser, the ability of a conventional rubber eraser to control an area of erasure based on the tilt of the eraser, e.g., a heavy area of erasure when the eraser is held at an angle or a shallow area of erasure when the eraser is held in a more upright position.