Active Pen Haptic Control for Pressure-Triggered Vibration Stop
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Solution Overview
Problem
There is a time lag in controlling the vibration of haptic elements in electronic pens, leading to discomfort when the pen tip is separated from a panel surface.
Innovation Solution
An active pen with a pressure sensor and integrated circuit that detects pen pressure and promptly stops the haptic element's vibration by applying a current in the opposite direction to the motor when the pen pressure falls below a predetermined value, or upon receiving a control signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the electronic apparatus controls the haptic element to reproduce the feel of writing on paper, then the writing sensation is improved, but the vibration does not stop immediately after pen separation causing user discomfort
Solution Approach 1:
The pressure sensor continuously monitors the pressure applied to the panel surface and provides real-time feedback to the integrated circuit. When the pressure falls below the threshold indicating pen separation, the feedback signal triggers the integrated circuit to immediately stop the haptic element's vibration, eliminating residual vibrations while maintaining the writing sensation during contact
Solution Approach 2:
The integrated circuit is pre-programmed with the threshold value and control logic. When pen separation is detected through pressure threshold comparison, the system has pre-prepared the stop command ready to execute immediately, ensuring rapid response without delay in stopping the vibration
2Ease of operation
If the haptic element vibrates continuously to maintain writing feel, then the sensory feedback is improved, but the time lag in control causes discomfort after pen separation
Solution Approach 1:
The active pen system uses its own internal pressure sensor and integrated circuit to autonomously detect pen separation and control the haptic element's vibration. This self-service mechanism eliminates the need for continuous external control signals from the electronic apparatus, reducing control time lag and enabling immediate response to pen separation
Solution Approach 2:
The integrated circuit is pre-programmed with the threshold value and control logic. When pen separation is detected through pressure threshold comparison, the system has pre-prepared the stop command ready to execute immediately, ensuring rapid response without delay in stopping the vibration
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
The vibration of the haptic element is stopped promptly after the pen tip separation, reducing user discomfort and eliminating residual vibrations due to inertia.
Implementation Method 1
a pressure sensor that, in operation, detects pressure applied to a pen tip
Implementation Method 2
an integrated circuit that, in operation, starts vibrating the haptic element when the communication device receives a control signal
Implementation Method 3
a communication device that, in operation, performs near field communication
Data Source
AI summary
Provided is an active pen including a haptic element, a pressure sensor that, in operation, detects pressure applied to a pen tip, a pen tip electrode provided on the pen tip, a communication device that, in operation, performs wireless communication, and an integrated circuit that, in operation, transmits, from the pen tip electrode, a downlink signal including a pen pressure value indicating a magnitude of the pressure detected by the pressure sensor, in which the integrated circuit, in operation, starts vibrating the haptic element when the communication device receives a control signal that instructs starting of vibration of the haptic element, and stops the vibrating of the haptic element when the pen pressure value falls below a first predetermined value.