Optical Element with Asymmetric Diffraction Structures to Eliminate Moiré Interference

Solution Overview

Problem

Current display technologies face issues with moiré interference patterns due to periodic structures, which affect display quality, and there is a need for an optical element that can eliminate these patterns.

Innovation Solution

An optical element with light deflection regions arranged along waveform tracks with varying periods and amplitudes, or diffraction structures having multiple periods, is used to prevent moiré interference by optimizing the distribution and arrangement of these regions on a display device's light output surface.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If periodic structures are used in display, then regular patterns are formed, but moiré interference patterns occur affecting display quality

Engineering Contradiction:

Core Design Contradiction:

ShapeVSObject-affected harmful factors

Solution Approach 1:

The patent introduces asymmetric irregularity regions within the periodic structure that break the symmetry and regularity required for moiré pattern formation. These asymmetric elements disrupt the interference conditions while preserving the overall periodic arrangement for light deflection functionality.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent applies local quality by creating specific irregularity regions at particular locations within the periodic structure. These localized irregularities are strategically placed to disrupt moiré pattern formation in critical areas while maintaining the periodic light-deflecting properties in other regions.

Inventive Principle:

Principle #3Local quality

2Use of energy by moving object

If optical film with pre-determined period is used, then light deflection is achieved, but moiré interference pattern is generated

Engineering Contradiction:

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent changes the periodic parameters by introducing variable period regions and irregularity regions that modify the local period values. This allows the optical film to maintain light deflection functionality while disrupting the uniform periodicity that causes moiré interference patterns.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent segments the periodic structure into multiple regions with different characteristics - regular periodic regions for light deflection and irregularity regions for moiré suppression. This segmentation allows simultaneous achievement of light deflection efficiency and interference pattern elimination.

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

The solution effectively eliminates moiré interference patterns while maintaining or enhancing display quality by adjusting the deflection effects and light distribution, ensuring clear and interference-free image display.

Implementation Method 1

each light deflection region comprises a diffraction structure having two or more than two amplitudes

Methodology Applied

Scientific EffectDiffraction: Diffraction

Data Source

PatentUS10996464B2Optical element and display device using the same

Publication Date: 2021.05.04

AI summary

An optical element including a first pattern is provided. The first pattern includes a film and a plurality of light deflection regions arranged on the film, wherein each light deflection region comprises a diffraction structure having two or more than two amplitudes.