Active Pencil Tip for Digitizer Position Detection
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Solution Overview
Problem
Existing digitizer sensors are less suitable for detecting small diameter writing tips of passive conductive styluses, as they are primarily designed for finger interaction, leading to inefficiencies in position detection and input recognition.
Innovation Solution
A device that converts a standard pencil into an active stylus by electrically connecting a signal generator and transmitter to the pencil lead, allowing it to transmit signals to a digitizer sensor, enabling position detection of the writing tip while touching or hovering, and providing a low-cost alternative to dedicated styluses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a passive conductive stylus with small diameter writing tip is used, then the pencil can be sharp and precise for writing, but the digitizer sensor cannot accurately detect its position because it is designed for finger interaction
Solution Approach 1:
The patent introduces an intermediary active stylus tip that mediates between the passive pencil and the digitizer sensor. This active tip contains electronic components (transmitter, power source) that generate electromagnetic signals detectable by the sensor, allowing precise position tracking while maintaining the sharp writing tip of the original pencil.
Solution Approach 2:
The invention makes the pencil multi-functional by combining the writing function of a passive pencil with the position detection capability of an active stylus. The hybrid design allows the same tool to both write sharply on the screen and be accurately tracked by the digitizer sensor simultaneously.
2Measurement precision
If a dedicated active stylus is used for accurate position detection, then the digitizer sensor can track position, angle, and direction accurately, but the cost is significantly higher than a standard pencil
Solution Approach 1:
The patent segments the stylus functionality into two separate parts: a inexpensive standard pencil body and a separate active stylus tip module. This segmentation allows the expensive active components (transmitter, power source, antenna) to be miniaturized and attached only to the tip, dramatically reducing overall cost while maintaining detection accuracy.
Solution Approach 2:
The invention uses a standard disposable pencil as the base, which is much cheaper than dedicated active styluses. The active tip module can be attached to or replaced on the pencil, allowing users to benefit from accurate tracking without investing in an expensive proprietary stylus system.
3Measurement precision
If an active stylus with transmitting components is used, then position and direction can be detected, but the device complexity increases significantly
Solution Approach 1:
The patent nests the active stylus tip module within or onto the simple pencil structure. The electronic components (transmitter, power source, antenna) are contained in a compact housing that fits on the pencil tip, keeping the overall structure simple while enabling advanced functionality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate and convenient input recognition on digitizer sensors with a sharp writing tip, offering a cost-effective solution for position detection and tracking of the pencil's position, angle, and direction, enhancing user interaction with digitizer systems.
Implementation Method 1
a signal generator and a transmitter that transmits a signal generated by the signal generator
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3C
AI summary
A device includes a connector configured to electrically contact a conductive core of a pencil and a circuit electrically connected to the contact. The circuit transmits a signal via the contact and the conductive core.