Dynamic Stylus Detection Frequency Switching for Power Optimization
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Solution Overview
Problem
Mobile devices face challenges in reducing system power consumption while maintaining high precision and efficiency for stylus operations, particularly when switching between stylus and finger input modes, which affects battery life and user experience.
Innovation Solution
A method and system for stylus detection that dynamically adjusts detection frequencies based on stylus activity, switching to higher frequencies for active stylus use and lower frequencies during inactivity to conserve power, and integrating mutual capacitance and self-capacitance detection for simultaneous stylus and finger input recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the terminal detects the input signal of the stylus at a high frequency to achieve quick response, then the response speed is improved, but the power consumption increases
Solution Approach 1:
The patent applies dynamics by making the detection frequency adjustable rather than fixed. The terminal dynamically switches between first frequency (low), second frequency (high), and third frequency (medium) based on stylus activity state, optimizing the balance between response speed and power consumption at different operational phases
Solution Approach 2:
The patent implements periodic action through time-period-based frequency switching. After detecting stylus input, the terminal uses high frequency for a first time period, then switches to medium frequency for a second time period, and finally to low frequency for a third time period. This periodic pattern ensures quick response when needed while conserving energy during idle states
2Use of energy by moving object
If the terminal detects the input signal of the stylus at a low frequency to reduce power consumption, then the power consumption is reduced, but the response speed decreases
Solution Approach 1:
The patent applies preliminary action by maintaining a medium detection frequency (third frequency) during the idle period between stylus interactions. This medium frequency is higher than the low frequency used during prolonged idle states but lower than the high frequency used during active stylus input, providing a ready state that can quickly transition to high frequency mode when stylus input is detected again
Solution Approach 2:
The system dynamically adjusts detection frequency based on stylus activity state, switching between low frequency (first frequency) for prolonged idle periods and medium frequency (third frequency) for shorter idle periods, optimizing the balance between power consumption and response readiness
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 approach enhances user experience by ensuring quick and precise stylus responses while reducing power consumption, thereby extending battery life and improving overall terminal efficiency.
Implementation Method 1
integrating mutual capacitance and self-capacitance detection for simultaneous stylus and finger input recognition
Data Source
AI summary
A stylus detection method includes detecting, by a terminal, an input signal of a stylus at a first frequency, receiving a first input of the stylus through a touchscreen, detecting, in response to the first input, the input signal of the stylus at a second frequency, detecting the input signal of the stylus at a third frequency when detecting the input signal of the stylus at the second frequency and when a duration in which the terminal does not detect the input signal of the stylus is greater than a first time period. The second frequency is greater than the third frequency and the third frequency is greater than the first frequency.