Electronic Pen Pressure Curve Adjustment for Hover Stability
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Solution Overview
Problem
Existing electronic pens may inaccurately detect pen pressure, leading to unintended ink rendering due to malfunction, friction, or wear of the pen pressure sensor, especially in hover states, and existing solutions require software or hardware-specific adjustments.
Innovation Solution
The electronic pen includes a pen pressure sensor that outputs a detected signal correlated with pen pressure, a control circuit to adjust a conversion characteristic curve based on predefined events, and signal processing to update sensitivity settings, independent of the electronic apparatus specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the electronic pen uses a pen pressure sensor to detect pen pressure amount, then ink rendering can simulate analog writing sense, but unwanted ink rendering may occur in hover state due to sensor malfunction, friction, or wear
Solution Approach 1:
The patent applies dynamics by making the conversion characteristic curve adjustable rather than fixed. The control circuit dynamically changes the rise sensitivity parameter based on detected events (such as pen lift events), allowing the system to adapt to different operational states. This resolves the contradiction by enabling the same sensor to accurately detect both hover state (with high sensitivity to prevent unwanted rendering) and writing state (with appropriate sensitivity for pressure variation)
Solution Approach 2:
The patent changes the parameter of rise sensitivity in the conversion characteristic curve based on detected events. When a pen lift event is detected, the control circuit adjusts the rise sensitivity parameter to prevent unwanted ink rendering during hover. This parameter adjustment allows the system to maintain measurement precision while ensuring reliability across different operational states
2Adaptability or versatility
If the electronic pen determines distance and controls ink rendering based on distance, then ink rendering can be controlled without contact, but different determination processing is needed for different software or hardware specifications of the electronic apparatus
Solution Approach 1:
The patent applies self-service by having the electronic pen independently determine its operational state (hover or contact) and adjust its own conversion characteristic curve accordingly. The control circuit detects events and autonomously adjusts the rise sensitivity parameter without requiring the electronic apparatus to provide device-specific determination processing. This eliminates the need for multiple determination algorithms across different devices
Data Source
AI summary
An electronic pen indicates a position on a planar sensor through communication with an electronic apparatus having the planar sensor. The electronic pen includes a pen pressure sensor that outputs a detected signal correlated with a pen pressure amount acting on a pen tip and a control circuit that is connected to the pen pressure sensor. The control circuit adjusts, on a conversion characteristic curve to which a detected value indicated by the detected signal output from the pen pressure sensor is input and from which a converted value indicating a magnitude of the pen pressure amount is output, a rise sensitivity, in which the pen pressure amount shifts from zero to non-zero, in response to detection of a predetermined event.