Power-Efficient Stylus With Non-Linear Finger Detection
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Solution Overview
Problem
Existing systems require either power-intensive active styli or passive styli that are difficult to distinguish from a user's finger, limiting efficient interaction with electronic devices.
Innovation Solution
A power efficient stylus with non-linear circuitry that provides a detectable electric field or modulated electrical signal when stimulated, allowing accurate detection by electronic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an active stylus with power intensive electronics is used, then the stylus can be distinguished from a user's finger and provide precise interaction, but the power consumption increases
Solution Approach 1:
The stylus uses the electrical signals already present on the display panel to stimulate its own non-linear circuitry, eliminating the need for separate power-intensive electronics. The stylus circuitry serves itself by using the display's existing electrical environment to generate the detectable response signal.
Solution Approach 2:
The patent changes the electrical characteristics of the stylus by introducing non-linear circuitry that creates harmonic distortion. This parameter change in the electrical response (adding harmonics) allows the stylus to be distinguished from a finger without requiring active power consumption, as the non-linear response is generated passively by the circuit elements.
2Use of energy by moving object
If a passive stylus is used, then the power consumption is reduced, but the stylus becomes difficult to distinguish from a user's finger
Solution Approach 1:
The patent changes the electrical parameters of the passive stylus by incorporating non-linear circuitry (diodes, transistors, capacitors) that create harmonic distortion when stimulated by the display's electrical signals. This parameter change transforms the electrical response signature, making the passive stylus distinguishable from a finger while maintaining low power consumption.
Solution Approach 2:
The patent replaces the mechanical distinction method (relying on physical differences between finger and stylus) with an electrical field-based detection method. The non-linear circuitry creates a unique electrical signature (harmonic distortion) that allows electronic differentiation between stylus and finger contact, substituting electrical properties for mechanical identification.
3Use of energy by moving object
If non-linear circuitry is added to the stylus, then the stylus becomes detectable with low power consumption, but the device complexity increases
Solution Approach 1:
The patent uses a minimal non-linear circuit configuration (a few diodes, transistors, and capacitors) that provides just enough harmonic distortion to enable detection. This partial action approach achieves the detection function with minimal circuit complexity, avoiding the need for sophisticated electronics while still creating a distinguishable electrical signature.
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 precise and power-efficient interaction with electronic devices by distinguishing the stylus from a user's finger, reducing power consumption and improving interaction accuracy.
Implementation Method 1
the non-linear circuitry is operative to provide a non-linear load between the body circuitry and the front tip interface component when the stylus circuitry is stimulated by an external stimulation, and the non-linear load is operative to provide a stylus electric field that is detectable by the electronic device
Implementation Method 2
the stylus is operative to drive a current back and forth through the tip stylus circuitry when the tip stylus circuitry is stimulated by an electrical signal provided by the input component of the electronic device, and the driven current is operative to provide a modulated version of the electrical signal that is detectable by the electronic device
Implementation Method 3
the tip stylus circuitry includes switch circuitry that is operative to alternate according to a pattern between a first state in which the body circuitry and the tip interface component are electrically coupled and a second state in which the body circuitry and the tip interface component are not electrically coupled, and the alternation of the switch circuitry is operative to provide a modulated capacitance at the tip interface component that is detectable by the electronic device
Data Source
AI summary
Systems, methods, and computer-readable media for enabling a power efficient stylus for an electronic device are provided.