Stylus Automated Power Switch Based on Writing Tip Position
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Solution Overview
Problem
Conventional stylus devices face issues with battery life reduction and ink splotches due to inadvertent activation of the power button, which disrupts the writing tip signal when not in use, leading to unnecessary power consumption and potential ink blotting on touchscreen displays.
Innovation Solution
A tip controller within the stylus automatically extends and retracts the writing tip, with a power interface that cuts off power when the tip is retracted and applies power when extended, preventing accidental activation and maintaining an active capacitive signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the stylus keeps power applied to the writing tip when not in use, then the capacitive signal remains active for immediate use, but battery life is reduced due to unnecessary power consumption
Solution Approach 1:
The stylus automatically detects its own state (in-use vs. not-in-use) through the tip position sensor and self-regulates power consumption by switching power to the writing tip based on whether the tip is extended or retracted, eliminating the need for manual power management by the user
Solution Approach 2:
The system uses feedback from the tip position sensor to continuously monitor whether the writing tip is extended or retracted, and automatically adjusts power consumption accordingly - when the tip is retracted, power is reduced to the writing tip, and when extended, power is restored
2Ease of operation
If the power button is exposed for easy activation, then the stylus can be quickly powered on, but inadvertent activation occurs when in pocket or stowed, causing battery drain and ink splotches
Solution Approach 1:
The patent removes the traditional exposed power button from the stylus interface, extracting the manual power activation function and replacing it with an automatic sensor-based power management system that determines power state based on tip position rather than user button presses
Solution Approach 2:
The tip position sensor acts as an intermediary between the physical state of the stylus (tip extended or retracted) and the power management system, automatically translating tip position into appropriate power consumption levels without requiring direct user interaction with power controls
3Measurement precision
If the writing tip signal is continuously active, then touch detection sensitivity is maintained, but ink splotches occur when the stylus is inadvertently activated and not actually touching the display
Solution Approach 1:
The system dynamically adjusts the capacitive signal state at the writing tip based on real-time tip position detection - the signal transitions from active to inactive state automatically as the tip moves between extended and retracted positions, allowing the system to adapt its signal characteristics to the current operational context
Data Source
AI summary
An information handling system stylus performs touch inputs at a touchscreen display with an active writing tip that receives a capacitive signal from a processing resource, such as an ASIC. A tip position controller selectively retracts and extends the writing tip at an opening formed in a tip cap disposed at the end of the stylus. A power interface cuts off power to the processing resource when the writing tip retracts and applies power to the processing resource when the writing tip extends.