Rotating Privacy Shutter Polarizer for Glass Reflection Cancellation

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Solution Overview

Problem

Screen reflections on participants' glasses during videoconferencing cause distractions and privacy/security concerns, necessitating a solution to filter out reflected polarized light effectively.

Innovation Solution

Integration of a camera with a privacy shutter that includes a polarizer capable of rotating to match the orientation of the display polarizer, thereby filtering out reflected polarized light.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a camera is integrated into a display device for videoconferencing, then communication functionality is improved, but screen reflections on participants' glasses cause distractions and privacy concerns

Engineering Contradiction:

Improvevideoconferencing functionalityVSAvoidscreen reflections on glasses

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies polarization filtering to convert the harmful reflected light into a benefit by blocking it. The polarizer in the privacy shutter is oriented to filter out polarized light reflections from glasses while allowing non-polarized or differently polarized light to pass through, thus eliminating the distraction and privacy issue while maintaining camera functionality

Inventive Principle:

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

2Object-affected harmful factors

If a polarizer is added to filter reflected light, then reflection cancellation is improved, but device complexity increases

Engineering Contradiction:

Improvereflected polarized lightVSAvoidcamera structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent merges the polarizer with the existing privacy shutter mechanism already present in the display device. By integrating the polarization filtering capability into the existing shutter structure rather than adding a completely separate component, the solution reduces overall device complexity while still achieving reflection cancellation

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The privacy shutter is designed to serve multiple functions: it provides traditional privacy coverage and simultaneously acts as a polarization filter when equipped with the polarizer. This multi-functionality eliminates the need for separate reflection-cancellation components, thereby reducing device complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Effectively reduces or eliminates screen reflections on glasses, enhancing privacy and reducing distractions during videoconferencing.

Implementation Method 1

a privacy shutter configured to selectively rotate a polarizer to a first orientation or a second orientation. One of the first orientation or the second orientation is used to filter reflected polarized light

Methodology Applied

Scientific EffectPolarisation: Polarisation

Data Source

PatentUS20260072481A1Camera integrated glass reflection cancellation

Publication Date: 2026.03.12 DELL PROD LP

AI summary

An information handling system has a camera disposed in a display device, and a privacy shutter configured to selectively rotate a polarizer to a first orientation or a second orientation. One of the first orientation or the second orientation is used to filter reflected polarized light.