Sensor Controller Mode Switching for Active Pen and Touch Input

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Solution Overview

Problem

Existing input systems that switch to an exclusive mode when an active pen is detected prevent touch input when the pen is close to the panel surface, causing inconvenience during operations like pinch-out gestures.

Innovation Solution

A sensor controller that detects both passive and active pointers by using a plurality of sensor electrodes, adjusts operation modes based on pen pressure, allowing touch input when the active pen is close to the panel surface by switching between time-division detection and exclusive modes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the input system is switched to the exclusive mode when the active pen is detected, then the detection rate of the active pen position is improved, but the touch input cannot be performed when the active pen is very close to the panel surface

Engineering Contradiction:

Improvedetection rate of active pen positionVSAvoidtouch input capability

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The system dynamically switches between SPT mode and exclusive mode based on the detection results. When the active pen is detected close to the panel surface, the system transitions from exclusive mode back to SPT mode, allowing touch input to be performed while maintaining active pen detection capability. This dynamic mode switching resolves the contradiction by adapting the operation mode to the current usage scenario.

Inventive Principle:

Principle #15Dynamics

2Productivity

If the input system is switched to the exclusive mode when the active pen is detected, then the detection rate of the active pen position is improved, but the false detection prevention function cannot be used

Engineering Contradiction:

Improvedetection rate of active pen positionVSAvoidfalse detection prevention

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system dynamically adjusts the operation mode based on detection results. When the active pen is detected close to the panel surface, the system switches from exclusive mode to SPT mode, where both active pen and passive pointer detection are performed in time division. This allows false detection prevention to function while maintaining high active pen detection rate through the time-division multiplexing approach.

Inventive Principle:

Principle #15Dynamics

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 touch input while using the exclusive mode, preventing false detections of passive pointers, and maintaining high detection accuracy for active pens.

Implementation Method 1

position detection of the passive pointer is performed by detecting capacitive coupling between a front end of the passive pointer and a sensor electrode arranged in a panel surface

Methodology Applied

Scientific EffectCapacitive coupling: Capacitance

Data Source

PatentUS12619327B2Position detection method of pointer and sensor controller

Publication Date: 2026.05.05 WACOM CO LTD

AI summary

Disclosed is a detection method performed by a sensor controller connected to a sensor including a plurality of sensor electrodes, the method detecting, with use of the sensor, a position of a passive pointer that does not transmit a signal and a position of an active pen that transmits a pen signal from a pen electrode provided on an end of the active pen. The method includes acquiring a pen pressure value indicating pressure applied to a pen tip of the active pen, and controlling an operation mode of the sensor controller according to the pen pressure value.