Electroactive Privacy Layer Micro Louvers for Dynamic Light Control

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Solution Overview

Problem

Conventional privacy screens for display devices often inhibit the functionality of touch screens and are not dynamic, as they do not allow for both privacy and transparent modes, restricting light propagation in all directions.

Innovation Solution

An electroactive privacy layer (EPL) with top and bottom electrodes and a dielectric material that forms micro louvers, allowing on-angle light to pass through while absorbing and diffusing off-angle light, enabling both privacy and transparent modes without interfering with touch screen functionality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a conventional privacy screen is used to restrict light propagation, then privacy is improved, but touch screen functionality is inhibited

Engineering Contradiction:

Improvelight propagation restrictionVSAvoidtouch screen functionality

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The patent replaces the mechanical privacy screen with an electroactive polymer layer that uses electrical fields to control light propagation. The electroactive polymer changes its physical state (contracting or relaxing) in response to applied voltage, thereby controlling light restriction dynamically without mechanical components that would interfere with touch functionality.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent implements a dynamic privacy control system where the electroactive polymer layer can switch between different states (contracted/relaxed) based on applied voltage. This allows the system to adapt between privacy mode (contracted state restricting light) and transparent mode (relaxed state allowing light), enabling both privacy protection and touch screen functionality at different times.

Inventive Principle:

Principle #15Dynamics

2Object-affected harmful factors

If a privacy screen restricts light propagation in all directions, then privacy is improved, but adaptability is reduced

Engineering Contradiction:

Improvelight propagation restrictionVSAvoidprivacy mode adjustability

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The electroactive polymer layer provides dynamic control by switching between contracted and relaxed states based on applied voltage. When voltage is applied, the polymer contracts to restrict light propagation for privacy mode. When voltage is removed or reduced, the polymer relaxes to allow light propagation for transparent mode, enabling adaptable privacy control.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system controls light propagation by changing the physical state of the electroactive polymer through parameter changes (voltage application). The polymer's contraction or relaxation state is directly controlled by electrical parameters, allowing flexible adjustment between privacy and transparency modes without physical reconfiguration.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If an electroactive privacy layer is used to enable dynamic control, then adaptability is improved, but device complexity is increased

Engineering Contradiction:

Improveprivacy mode adjustabilityVSAvoiddisplay stack integration

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges the electroactive polymer layer directly into the display stack, integrating the privacy control functionality with the existing display structure. The electroactive polymer is positioned between the backlight assembly and the display panel, combining multiple functions (light generation, privacy control, and display) in a single integrated structure rather than adding separate components.

Inventive Principle:

Principle #5Merging (Combining)

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 EPL effectively restricts off-angle light propagation during privacy mode while allowing direct viewing, maintaining touch screen functionality and conserving power by activating privacy mode as a default.

Implementation Method 1

activating or deactivating the micro louvers based on voltage differentials

Methodology Applied

Scientific EffectElectrostatic actuation: Electrostatics

Implementation Method 2

absorb and diffuse light incident on the micro louvers

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 3

absorb and diffuse light incident on the micro louvers

Methodology Applied

Scientific EffectLight scattering: Scattering

Data Source

PatentUS10061370B2Micro louvers for active privacy screen

Publication Date: 2018.08.28 INTEL CORP

AI summary

Disclosed herein are techniques related to privacy at display devices. The techniques include an apparatus having an electroactive privacy layer of a display device. The electroactive privacy layer is configured to restrict a propagation direction of light emission associated with a display layer of the display device. The restriction of propagation is generated by micro louvers formed in the electroactive privacy layer.