Active Pen Power Mode Switching for Low-Battery Position Detection
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Solution Overview
Problem
Active pens with built-in power supplies face operational issues due to insufficient power when the remaining amount is low, leading to inability to perform desired functions.
Innovation Solution
The active pen and position detection system incorporate a controller that switches between normal and low power consumption modes based on the remaining power level, adjusting operations such as signal transmission and reception to conserve energy when power is low.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the active pen operates in normal mode with continuous signal transmission and reception, then the communication functionality and position detection accuracy are improved, but the power consumption increases leading to insufficient operation time when power remaining amount is low
Solution Approach 1:
The active pen dynamically switches between normal mode and low power consumption mode based on the remaining power level. When power is sufficient, the pen operates in normal mode with continuous transmission and reception. When power drops below a threshold, it automatically transitions to low power consumption mode, adjusting the occurrence rate and performance amount of driving operations to maintain functionality while conserving energy.
Solution Approach 2:
The system changes operational parameters based on power status. In normal mode, the occurrence rate of specific driving operations is high and performance amount is large. In low power consumption mode, these parameters are reduced - the occurrence rate of signal transmission and reception operations is lowered, and the performance amount of attendant functions is reduced, thereby decreasing power consumption while maintaining basic functionality.
2Duration of action of moving object
If the active pen reduces signal transmission and reception operations to save power, then the power consumption decreases extending operation time, but the communication reliability and position detection accuracy deteriorate
Solution Approach 1:
In low power consumption mode, the system performs partial operations rather than full operations. The occurrence rate of specific driving operations is reduced but not eliminated - signal transmission and reception still occur at reduced frequency, and attendant functions are performed with reduced performance amount. This partial action maintains basic communication functionality while significantly reducing power consumption to extend operation time.
3Adaptability or versatility
If the active pen performs attendant functions such as vibration and wireless communication frequently, then the user experience and functionality are improved, but the power consumption increases reducing the benefit of low power consumption mode
Solution Approach 1:
The controller dynamically adjusts the performance amount of attendant functions based on power status and operational context. In low power consumption mode, the occurrence rate of attendant function execution is reduced, and when executed, the performance amount is limited. This dynamic adjustment maintains essential functionality while minimizing power consumption from vibration, wireless communication, and other attendant features.
Data Source
AI summary
Provided is an active pen used with electronic equipment including a touch sensor that is of a capacitive system and that includes sensor electrodes, the active pen including a receiving circuit that receives an uplink signal from the electronic equipment, a transmitting circuit that transmits a downlink signal to the electronic equipment, an attendant function circuit that performs an attendant function different from reception of the uplink signal and transmission of the downlink signal, and a controller that controls operation of the receiving circuit, the transmitting circuit, or the attendant function circuit according to a plurality of kinds of operation modes including a normal mode and a low power consumption mode.