Stylus Low-Power Detector with Dynamic State Switching
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Solution Overview
Problem
Current touch sensors, particularly capacitive touch screens, face challenges in accurately detecting signals from styluses due to noise interference and limited power efficiency in signal detection and processing, which affects the reliability and responsiveness of touch-based interactions.
Innovation Solution
A stylus equipped with a low-power detector and advanced filtering mechanisms, such as digital asynchronous filters, is used to enhance signal detection and processing, allowing for efficient power management and improved signal fidelity, enabling accurate communication with touch sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional detectors are used in the stylus, then signal detection capability is maintained, but power consumption increases and reduces battery life
Solution Approach 1:
The detector operates in multiple dynamic states: a low-power first state for basic signal detection and a high-power second state for enhanced signal processing. The system dynamically transitions between these states based on detection needs, allowing the stylus to maintain signal detection capability while significantly reducing average power consumption during normal operation.
Solution Approach 2:
The detector periodically switches between the first low-power state and the second high-power state. During the first state, it performs basic detection functions with minimal power consumption. When signal quality requires enhanced processing, it transitions to the second state temporarily, then returns to the first state, creating a periodic action pattern that balances power efficiency with detection reliability.
2Speed
If continuous signal processing is performed, then responsiveness is improved, but power consumption increases
Solution Approach 1:
Signal processing is performed periodically rather than continuously. The detector switches between active processing states and low-power states, maintaining system responsiveness by processing signals at strategically timed intervals while dramatically reducing overall power consumption compared to continuous processing.
Solution Approach 2:
The system dynamically adjusts its processing intensity and frequency based on operational context. During periods requiring high responsiveness, it activates enhanced processing modes; during stable periods, it reduces processing activity to conserve power, creating a dynamic balance between responsiveness and power consumption.
3Measurement precision
If noise filtering is applied, then signal accuracy is improved, but processing time increases
Solution Approach 1:
The system applies partial noise filtering by selecting appropriate filter strengths based on signal conditions. Rather than always applying maximum filtering which would maximize accuracy but also maximize processing time, it applies just enough filtering to achieve acceptable accuracy levels, reducing unnecessary processing time while maintaining signal accuracy.
Solution Approach 2:
Different filtering approaches are applied to different aspects of the signal based on local characteristics. The system analyzes signal properties and applies targeted filtering only where needed, rather than uniformly filtering the entire signal, thus improving accuracy in critical areas while minimizing overall processing time.
Data Source
AI summary
In one embodiment, a stylus includes a receiver for receiving signals wirelessly transmitted by a device. The stylus can alternate, during a first period of time, power supplied to the receiver between a first power for a first duration and a second power for a second duration. The first power is greater than the second power. The stylus can determine how many events exceeding an event criteria occurred the each first duration, and if the events exceed a threshold, the stylus can initiate wakeup components in the stylus for communicating with the device by initiating a provision of third power to those components. The third power is greater than the first power. When the first period of time expires, the stylus can provide low power to the receiver for a second period of time.