Tethered Stylus Audio Interface Position Detection
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Solution Overview
Problem
Current styluses, especially active and wireless ones, are expensive and pose risks of loss and high power consumption, making them inaccessible for widespread use on touch panels, while existing technologies struggle to distinguish between fingers and styluses accurately.
Innovation Solution
A tethered stylus design utilizing an existing audio interface of touch-sensitive electronic devices, featuring a signal line and grounded line with a capacitor and resistor, allows for cost-effective production and recognition by the device, enabling the stylus to emit specific signal phases for accurate position detection on touch screens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an active stylus is used to provide precise input for touch panels, then measurement precision is improved, but manufacturing cost increases significantly
Solution Approach 1:
The patent employs a passive stylus design using inexpensive components (capacitor, resistor, connecting lines) instead of expensive active styluses with batteries and wireless modules. This disposable-like approach eliminates the need for costly power sources and complex electronics while achieving sufficient precision for touch panel interaction.
Solution Approach 2:
The stylus utilizes the existing audio interface of the touch panel device to transmit signals, making the audio interface serve a dual purpose (audio output and stylus communication). This multi-functionality eliminates the need for dedicated stylus communication hardware, reducing manufacturing costs while maintaining precision capabilities.
2Ease of operation
If a wireless stylus is used to avoid physical connection, then ease of operation is improved, but risk of loss and power consumption increase
Solution Approach 1:
The patent introduces a physical tether (connecting lines) as an intermediary between the stylus and the touch panel device. This physical connection eliminates the risk of loss associated with wireless styluses while maintaining ease of operation through a simple plug-and-play connection via the audio interface.
3Ease of manufacture
If a tethered stylus with audio interface is used, then manufacturing cost is reduced, but device complexity increases
Solution Approach 1:
The patent extracts the signal transmission function from complex active stylus systems and implements it through simple passive components (capacitor, resistor, connecting lines). By removing unnecessary active elements and utilizing the existing audio interface, the design achieves low cost while introducing minimal complexity to the overall system.
4Ease of manufacture
If the audio interface is used for stylus connection, then manufacturing cost is reduced, but interference with audio signals may occur
Solution Approach 1:
The patent employs periodic action through the capacitor component that periodically charges and discharges, creating alternating current signals for stylus communication. This periodic signal generation allows the audio interface to differentiate between audio signals and stylus signals, reducing interference while maintaining the cost advantage of using the existing audio interface.
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
This solution reduces the manufacturing cost of styluses, enhances their accessibility, and allows for precise position detection on touch screens by differentiating between fingers and styluses, while minimizing interference and power consumption.
Implementation Method 1
a capacitor, having two ends respectively coupling to the signal line and the tip section
Implementation Method 2
a resistor, having two ends respectively coupling to the tip section and the grounded line
Implementation Method 3
the processor commands the audio processor to recognize the external object as a tethered stylus or an audio outputting device based on a circuit impedance of the external object
Implementation Method 4
the touch sensitive processing apparatus determining a position where the tip section is touching or approximating the touch screen based on receiving electrical signals sensed by the first and second electrodes
Data Source
AI summary
A touch sensitive processing method is applicable to a touch sensitive electronic system comprising a stylus, an audio processor coupling to the stylus, a touch screen, and a touch sensitive processing apparatus coupling to the touch screen. The method comprises having the audio processor driving a tip section of the stylus for emitting electrical signals; and having the touch sensitive processing apparatus receiving sensed electrical signals via the touch screen for determining a position where the tip section is touching or approximating the touch screen.