Diffractive Display Pixels With Absorptive Metastructures

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Solution Overview

Problem

Conventional passive diffractive displays suffer from reduced signal-to-noise ratio due to reflection from unpopulated regions of frame-pixels, leading to degraded imagery quality and reduced viewing angles.

Innovation Solution

Incorporating absorptive metastructures into the unpopulated regions of frame-pixels to absorb unwanted light and reduce reflection, thereby enhancing the signal-to-noise ratio and maintaining vivid imagery across a range of viewing angles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If conventional passive diffractive displays are used without absorptive layers, then the device remains thin and suitable for security features, but reflection from unpopulated regions degrades image quality and reduces signal-to-noise ratio

Engineering Contradiction:

Improvereflection from unpopulated regionsVSAvoiddevice structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent combines the absorptive layer with the diffractive pixel structure by integrating absorptive material into the unpopulated regions of frame-pixels. This merging approach eliminates the need for separate anti-reflection layers while reducing harmful reflections that degrade image quality outside the viewing zone.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The absorptive material is selectively applied only to unpopulated regions of frame-pixels where reflection occurs, rather than covering the entire display. This localized application reduces harmful reflections without interfering with the diffractive functionality of populated regions, maintaining thin device profile.

Inventive Principle:

Principle #3Local quality

2Reliability

If absorptive layers are added to reduce reflection, then signal-to-noise ratio improves, but device thickness increases making it unsuitable for security features

Engineering Contradiction:

Improvesignal-to-noise ratioVSAvoiddevice thickness

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

The patent employs porous absorptive materials that can be deposited as thin films within the unpopulated regions of frame-pixels. These porous structures provide effective light absorption and reflection reduction while maintaining minimal thickness, enabling integration into thin security feature applications.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The absorptive layer is implemented as a thin film integrated into the diffractive display structure. This thin-film approach provides sufficient absorption to improve signal-to-noise ratio while keeping the overall device thickness compatible with security feature requirements.

Inventive Principle:

Principle #30Flexible shells and thin films

3Illumination intensity

If diffractive scatterers are configured to maximize diffraction efficiency at a particular wavelength, then colored imagery is enhanced at the diffraction angle, but reflection from unpopulated regions degrades appearance at angles remote from diffraction channels

Engineering Contradiction:

Improvediffracted light intensityVSAvoidspecular reflection at remote angles

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful specular reflection from unpopulated regions into a beneficial effect by applying absorptive material that selectively absorbs reflected light. This transforms the previously harmful reflection into controlled light management, improving image quality and contrast at angles remote from the diffraction channels while preserving the intense colored imagery at the diffraction angle.

Inventive Principle:

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

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 integration of absorptive metastructures improves the signal-to-noise ratio, resulting in vivid, colored imagery viewable over a broader range of angles and reduces unwanted reflection, enhancing the overall display quality.

Implementation Method 1

absorptive metastructures configured to have a light absorption resonance in the visible spectrum

Methodology Applied

Scientific EffectLight absorption resonance: Absorption (EM radiation)

Implementation Method 2

A diffraction pixel diffracts the incident light at the diffraction wavelength into certain diffraction channels angularly arranged in space, where the diffraction angle of each channel is determined by the incidence angle, periodicity of scatterers, and diffraction wavelength

Methodology Applied

Scientific EffectDiffraction: Diffraction

Implementation Method 3

The superposition of the interfering wave components from the scatterers may lead to a constructive or destructive interference at the observation point

Methodology Applied

Scientific EffectInterference: Interference

Data Source

PatentUS12578517B2Diffractive displays

Publication Date: 2026.03.17 AUTHENTIX INC

AI summary

The present disclosure provides a diffractive display for displaying a diffracted image, an article, comprising the diffractive display, and methods of forming a display for displaying a diffracted image.