Active Stylus Duty Cycling for Responsive Low-Power Input
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Solution Overview
Problem
Existing touch-sensitive devices face challenges in efficiently managing power consumption and transitioning between operational modes, particularly with active styluses, leading to inefficiencies and potential battery drain.
Innovation Solution
Implementing a power management system for active styluses that includes multiple power modes (deep sleep, sleep, and active) and duty cycling of components to optimize power usage based on user input and device interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If components are continuously activated to ensure responsive operation, then user interaction responsiveness is improved, but power consumption increases
Solution Approach 1:
The system dynamically transitions between three power modes (deep sleep, sleep, and active) based on operational state. In deep sleep mode, minimal components are activated; in sleep mode, additional components become operational; in active mode, full system functionality is enabled. This dynamic adaptation allows the stylus to respond appropriately to user needs while optimizing power consumption at each state.
Solution Approach 2:
The power management system implements periodic duty cycling where components are activated in scheduled intervals rather than continuously. The controller periodically wakes from low-power states to check for input events, process data, and return to sleep mode. This periodic operation maintains system responsiveness while dramatically reducing average power consumption compared to continuous operation.
2Adaptability or versatility
If all components are activated to provide full functionality, then device capability is improved, but battery life decreases
Solution Approach 1:
The power management system segments device functionality into distinct operational modes with progressively activated components. Deep sleep mode activates only essential minimal components; sleep mode adds intermediate functionality; active mode enables complete device capabilities. This segmentation allows the stylus to provide full functionality when needed while extending battery life through selective component activation in lower-power states.
Solution Approach 2:
The system changes operational parameters (power state, component activation level, clock frequency, voltage levels) based on usage conditions. By adjusting these parameters dynamically, the stylus can operate with full functionality during active use while transitioning to parameter-optimized low-power states during idle periods, thereby extending battery life without permanently reducing device capability.
3Use of energy by moving object
If power modes are frequently transitioned to optimize power usage, then energy efficiency is improved, but system complexity increases
Solution Approach 1:
The power management system operates autonomously with minimal user intervention. The controller automatically monitors operational state, determines appropriate power mode transitions, and executes mode changes based on predefined criteria. This self-service approach simplifies the user interface while managing the inherent complexity of multi-mode power management internally, maintaining power efficiency without burdening the user with complex controls.
Data Source
AI summary
In one embodiment, a stylus includes one or more electrodes and one or more computer-readable non-transitory storage media embodying first logic for transmitting signals wirelessly to a device through a touch-sensor of the device. The stylus has a first power mode in which components of the stylus for receiving signals from or transmitting signals to the device are powered off; a second power mode in which components of the stylus for receiving signals from the device are powered on at least periodically and components of the stylus for transmitting signals to the device are powered off; and a third power mode in which components of the stylus for transmitting signals to the device are powered on at least periodically. The media further embodies second logic for transitioning the stylus from one of the first, second, and third power modes to another one of the first, second, and third power modes.