Dual Shielding Member for Pen Input Recognition

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Solution Overview

Problem

Electronic devices with pen input capabilities often experience malfunctions due to electromagnetic fields generated by the pen input device, leading to incorrect recognition of pen inputs.

Innovation Solution

The electronic device incorporates a dual shielding system, comprising a first shielding member made of a soft magnetic material and a second shielding member made of a conductive material, with a component region corresponding to electronic components. The second shielding member includes a portion or mesh structure removed from the component region to reduce induced currents.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a shielding member is disposed under the recognition member to block electromagnetic fields, then electromagnetic interference is reduced, but inductance decreases due to induced currents

Engineering Contradiction:

Improveelectromagnetic interferenceVSAvoidpen input recognition accuracy

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The shielding member is divided into multiple regions: a first region that blocks electromagnetic fields and a second region with removed portions that minimizes induced currents. This segmentation allows different parts of the shielding member to perform different functions - one part provides electromagnetic shielding while the other part reduces harmful current induction.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the shielding member have different structural qualities. The first region maintains continuous shielding structure for electromagnetic field blocking, while the second region has localized removed portions specifically positioned to reduce induced currents without compromising overall shielding effectiveness.

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If the shielding member is made of conductive material to improve shielding effectiveness, then electromagnetic field blocking is enhanced, but induced currents increase causing inductance decrease

Engineering Contradiction:

Improveelectromagnetic field blockingVSAvoidinduced currents

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

Portions of the shielding member are intentionally removed from the second region to extract and eliminate the source of induced currents. By removing these specific portions, the patent reduces the areas where currents can be induced while preserving the shielding functionality in other regions.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent acknowledges that conductive shielding materials generate induced currents as a harmful side effect, but by strategically removing portions of the shielding member, it converts this harmful effect into a beneficial design feature where the removed regions specifically target and eliminate current induction problems.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Object-affected harmful factors

If the shielding member covers the entire area under the recognition member, then comprehensive electromagnetic shielding is achieved, but device complexity and manufacturing difficulty increase

Engineering Contradiction:

Improveelectromagnetic shielding coverageVSAvoidshielding member structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The shielding member structure is segmented into different functional regions with different levels of coverage. Rather than uniform full-area coverage, the first region provides comprehensive shielding while the second region has selective coverage with removed portions, simplifying the overall structure while maintaining essential shielding functions.

Inventive Principle:

Principle #1Segmentation

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

This configuration effectively reduces the current induced in the electronic device by the magnetic field from the pen input device, alleviating the decrease in inductance and thereby minimizing malfunction and improving pen input recognition.

Implementation Method 1

a first shielding member disposed under the recognition member (502) and made of a soft magnetic material

Methodology Applied

Scientific EffectMagnetic field shielding: Magnetic Field

Implementation Method 2

the second shielding member (504) disposed under the first shielding member (503) and made of a material different than the first shielding member (503)... at least a portion of the second shielding member (504) removed from the component region

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS12235684B2Shielding member and electronic device including the same

Publication Date: 2025.02.25 SAMSUNG ELECTRONICS CO LTD

AI summary

An electronic device according to various embodiments disclosed in this document may include: a display panel; a recognition member disposed under the display panel and including a conductive pattern to recognize a signal from a pen input device; a first shielding member disposed under the recognition member; and a second shielding member disposed under the first shielding member and made of a material different than the first shielding member, wherein the second shielding member includes a component region corresponding to at least one electronic component disposed under the second shielding member, and wherein at least a portion of the second shielding member is removed from the component region.