Digitizing Tablet Stylus Detection Suspend Mode
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Solution Overview
Problem
Existing digitizing tablet computers require affirmative user action or automatic timing to enter suspend mode, leading to inefficient power consumption management.
Innovation Solution
A digitizing tablet system with a display surface, pen sensor, and controller that detects a digitizing stylus using capacitive-inductive circuitry, allowing automatic placement into suspend mode upon simultaneous detection of electromagnetic induction from the stylus's LC circuitries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the tablet uses automatic timing to enter suspend mode, then power consumption is reduced, but the user must wait for the predetermined time period
Solution Approach 1:
The system uses the stylus itself as the trigger mechanism - when the stylus is placed on the display surface, it automatically triggers the suspend mode without requiring user configuration or waiting. The stylus's presence serves as the service signal that initiates the power-saving state.
Solution Approach 2:
The tablet continuously monitors the display surface for stylus presence in advance, so when the stylus is placed down, the system is already prepared to immediately transition to suspend mode without any delay or waiting period.
2Ease of operation
If the tablet requires affirmative user action to enter suspend mode, then the system remains responsive to user needs, but power consumption increases during idle periods
Solution Approach 1:
The stylus interaction serves dual purposes - it is both the user's natural writing/drawing action and the trigger for power-saving mode. The system interprets the stylus placement as a self-service signal to enter suspend mode, eliminating the need for separate power management actions.
Solution Approach 2:
The stylus placement action serves multiple functions: it can be used for writing/drawing on the display and simultaneously acts as the trigger signal for entering suspend mode. This multi-functionality resolves the contradiction by making the same action serve both user interaction and power management needs.
3Loss of energy
If the tablet enters suspend mode immediately upon stylus detection, then power consumption is reduced, but the user may accidentally trigger suspend mode
Solution Approach 1:
The system replaces simple capacitive touch detection with electromagnetic induction detection using LC circuitry. This substitution provides more reliable and distinctive signal characteristics that are less prone to false activation from accidental touches or environmental interference.
Solution Approach 2:
The patent implements electromagnetic induction detection at specific locations within the display surface rather than uniform capacitive sensing. By localizing the detection capability to specific regions with LC circuitry, the system achieves more precise and reliable stylus detection that reduces accidental triggers.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient power management by automatically placing the tablet in suspend mode when the stylus is properly positioned, reducing unnecessary power consumption and enhancing user convenience.
Implementation Method 1
determining if the first message from the receiving circuitry is indicative of simultaneous detection of electromagnetic induction from two locations of the digitizing stylus
Data Source
AI summary
A digitizing tablet is provided, comprising: a display surface with a digitizer which detects a location of a front tip of a digitizing stylus, a pen sensor configured to detect the digitizing stylus being placed flatly on the display surface and, in response, to transmit a detecting signal, and a controller electrically coupled to the pen sensor. The controller is configured to execute instructions for: receiving the detecting signal from the pen sensor; and placing the digitizing tablet into a suspend mode upon receipt of the detecting signal.