Transmission-Type Electronic Pen Hover Detection Power Management
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Solution Overview
Problem
Conventional transmission-type electronic pens using pressure sensing switches require pen tip pressing to initiate transmission, leading to a time lag and discomfort due to inability to detect the 'hover state' and unnecessary power consumption after the switch is turned off.
Innovation Solution
A transmission-type electronic pen with a tubular casing, a core body, a supply source, a transmission circuit, a detector for direct user actuation, and a controller that activates the transmission circuit based on user interaction and pressure detection, allowing for power-saving modes and continuous hover state detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission circuit continuously transmits signals, then the position detection function is always available, but the power consumption increases and battery life decreases
Solution Approach 1:
The transmission circuit operates periodically rather than continuously. It transmits signals at intervals determined by a timer, allowing the system to maintain position detection capability while reducing overall power consumption. The circuit alternates between active transmission states and sleep states.
Solution Approach 2:
The electronic pen automatically manages its transmission cycles without user intervention. The control circuit monitors the timer and autonomously activates or deactivates the transmission circuit based on elapsed time, eliminating the need for manual switch operation while optimizing power usage.
2Use of energy by moving object
If a pressure sensing switch is used to activate transmission, then power consumption is reduced when not in use, but the user experience suffers due to time lag and inability to detect hover state
Solution Approach 1:
The transmission circuit is activated in advance of actual contact with the input surface. When the pen approaches the surface, the timer triggers transmission before the pressure switch is activated, allowing the system to detect the hover state and eliminate the time lag that occurs with pressure-only activation.
Solution Approach 2:
The transmission circuit maintains continuous operation during the hover state and initial contact period. By keeping the transmission active from approach through contact, the system ensures uninterrupted position detection capability, improving ease of operation while still managing power through controlled deactivation after a predetermined time without contact.
3Ease of operation
If the transmission circuit remains active after switch off for a predetermined time, then the user can immediately continue input operations, but power is uselessly consumed when the pen is not being used
Solution Approach 1:
The control circuit continuously monitors the state of the pressure sensing switch and the elapsed time since transmission activation. Based on this feedback, it determines whether to maintain or deactivate the transmission circuit, optimizing the balance between continuous input capability and power conservation.
Solution Approach 2:
The transmission circuit's operational state is dynamically adjusted based on real-time conditions. It remains active for a predetermined period after switch off to enable continuous input, but automatically deactivates if contact is not detected within that period, adapting its behavior to actual usage patterns to minimize useless power consumption.
Data Source
AI summary
A transmission-type electronic pen that detects a hover state by a position detecting device and achieves power savings is provided. The pen includes a transmission circuit that transmits a signal to a position detecting device and a detector configured to detect a direct act of a user. The pen includes a pressure detector configured to detect whether a pressure is applied to a tip of a core body, and a controller configured to activate and control transmission operation of the transmission circuit based on detection outputs of the detector and the pressure detector. The transmission circuit is controlled in accordance with any of a plurality of transmission operation states including at least a power saving state. When detecting an act of the user, the controller activates and sets the transmission circuit to a first transmission operation state of the plurality of states.