Dynamic Active Stylus Shielding for Position and Tilt Accuracy

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Solution Overview

Problem

Existing styluses experience positional and angular sensing inaccuracies due to miniaturized electronic components causing signal interference and reduced signal reception clarity, especially with centralized electrodes.

Innovation Solution

A dynamically controlled active stylus with a shielding electrode and a dynamic module that switches its electrical potential state between floating and ground potentials during operation frames to enhance signal reception and positioning accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the volume of the electrode is increased to enhance signal clarity, then the signal reception clarity is improved, but the position and tilt angle sensing accuracy deteriorates

Engineering Contradiction:

Improvesignal reception clarityVSAvoidposition and tilt angle sensing accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The electrode structure is segmented into multiple electrodes with different functions: a first electrode for signal transmission/reception and a second electrode for shielding. This segmentation allows each electrode to be optimized for its specific function, resolving the contradiction between signal clarity and sensing accuracy.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A shielding electrode (second electrode) is introduced as an intermediary element between the signal electrode and the external environment. This shielding electrode blocks external electromagnetic interference, allowing the signal electrode to maintain smaller dimensions while still achieving clear signal reception.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Volume of moving object

If electronic components are miniaturized to pursue precision design, then the device size is reduced, but the mutual interference between electrodes worsens

Engineering Contradiction:

Improveelectronic component sizeVSAvoidmutual interference between electrodes

Core Design Contradiction:

Volume of moving objectVSObject-generated harmful factors

Solution Approach 1:

The shielding electrode acts as an intermediary that isolates the signal electrode from external electromagnetic interference. This allows miniaturization of the overall device while maintaining signal integrity by blocking interference paths between closely spaced components.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The electrical potential state of the shielding electrode is dynamically changed between floating potential during signal reception and ground potential during signal transmission. This parameter change optimizes the shielding effect at different operational stages, reducing mutual interference in miniaturized configurations.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If multiple electrodes are positioned closely together, then the device complexity is reduced, but the signal transmission accuracy deteriorates

Engineering Contradiction:

Improveelectrode arrangement simplicityVSAvoidsignal transmission accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The shielding electrode is positioned between the signal electrode and external sources, creating a simplified two-electrode configuration that maintains high signal transmission accuracy by blocking interference paths without requiring complex multi-electrode arrangements.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 solution improves signal reception and positioning capabilities by reducing interference between electrodes, ensuring accurate digitizer tracking of the stylus's position and tilt angle.

Implementation Method 1

a dynamic module connected to the shielding electrode and configured to dynamically switch an electrical potential state of the shielding electrode

Methodology Applied

Scientific EffectElectrical potential state switching:

Implementation Method 2

controlling the active stylus to be in a receiving state wherein the electrical potential state of the shielding electrode is maintained in a floating potential

Methodology Applied

Scientific EffectElectrostatic shielding: Faraday Cage

Implementation Method 3

controlling the active stylus to enter a transmitting state wherein the electrical potential state of the shielding electrode is maintained in a ground potential

Methodology Applied

Scientific EffectGrounding: Earthing

Data Source

PatentUS20250298474A1Dynamically controlled active stylus and dynamical stylus control method

Publication Date: 2025.09.25 SILICON INTEGRATED SYSTEMS CORP

AI summary

A dynamically controlled active stylus and dynamical stylus control method are provided. The dynamical stylus control method for dynamically controlling active stylus operates through the dynamical controlled active stylus. The dynamical controlled active stylus includes a tip electrode, a shielding electrode, a ring electrode, and a dynamic module. The control method for dynamically controlling stylus includes: controlling the active stylus to be in a receiving state within a frame of operation of the active stylus, such that the shielding electrode is at a floating potential, and controlling the active stylus to be in a transmitting state within the frame of operation of the active stylus such that the shielding electrode is at a ground potential.