Relief Hologram Subpixel Layout for Wide-Angle Image Continuity

Solution Overview

Problem

Relief holograms designed to display a continuously changing image in a wide angular range cause discomfort to observers due to changes in image shape and position with illumination or observation direction, leading to blurred images and a feeling of unease.

Innovation Solution

A display design incorporating a combination of first and second subpixels with different angular ranges and intensities, where first subpixels emit diffracted light in a narrower angle with higher intensity, and second subpixels emit diffracted light in a wider angle with lower intensity, allowing for a clear and smooth image transition across a wide angular range without causing discomfort.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If adhesive labels are applied directly to flexible display screens during assembly, then positioning accuracy is improved, but the risk of bubbles and contamination increases due to handling

Engineering Contradiction:

Improvepositioning accuracyVSAvoidbubbles and contamination

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The labeling process is divided into two independent stages: first, the adhesive label is precisely positioned on the transfer foil in a controlled environment; second, the entire assembly is transferred to the display screen as a unit. This segmentation allows each stage to be optimized independently, achieving both precision and cleanliness.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The transfer foil serves as an intermediary carrier that temporarily holds the adhesive label. This mediator enables the label to be prepared and positioned with high precision on the foil, then transferred to the display screen without direct handling, thereby avoiding bubbles and contamination while maintaining positioning accuracy.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If adhesive labels are positioned and applied in a single step directly on the display screen, then the process is simpler, but positioning accuracy deteriorates due to handling and alignment difficulties

Engineering Contradiction:

Improveprocess simplicityVSAvoidpositioning accuracy

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The labeling process is divided into two independent stages: first, the adhesive label is precisely positioned on the transfer foil in a controlled environment; second, the entire assembly is transferred to the display screen as a unit. This segmentation allows each stage to be optimized independently, achieving both precision and cleanliness.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The adhesive label is positioned and prepared on the transfer foil in advance, before the actual assembly with the display screen. This preliminary action allows for precise positioning and quality control to be performed under optimal conditions, with the pre-assembled unit then being transferred as a complete package, eliminating alignment difficulties during final assembly.

Inventive Principle:

Principle #10Preliminary action

3Loss of substance

If adhesive labels are handled directly on the display screen, then material usage is efficient, but the risk of damage to the flexible display screen increases

Engineering Contradiction:

Improvematerial usage efficiencyVSAvoiddisplay screen integrity

Core Design Contradiction:

Loss of substanceVSStrength

Solution Approach 1:

The transfer foil serves as an intermediary carrier that temporarily holds the adhesive label. This mediator enables the label to be prepared and positioned with high precision on the foil, then transferred to the display screen without direct handling, thereby avoiding bubbles and contamination while maintaining positioning accuracy.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 display achieves a clear and aesthetically pleasing continuously changing image by minimizing the impact of ghost images and blurring, providing high visibility and definition across a wide range of observation directions.

Implementation Method 1

an adhesive label (150) including a first adhesive layer (152)

Methodology Applied

Scientific EffectAdhesive bonding: Adhesive

Data Source

PatentEP3761074B1Display body, transfer foil, adhesive label, and article with display body

Publication Date: 2026.05.06 TOPPAN HOLDINGS INC

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AI summary

A continuously changing image can be displayed in a wide angular range without causing a feeling of unease to observers. A display includes a plurality of pixels (PX) each including a plurality of first subpixels (SPX1) and a plurality of second subpixels (SPX2). In each of the plurality of pixels (PX) of the display, when illumination light is applied to the plurality of first subpixels (SPX1) from a normal direction, no diffracted light emerges from the plurality of first subpixels (SPX1), or first diffracted light emerges from the plurality of first subpixels (SPX1) in a first angular range, and when the illumination light is applied to the plurality of second subpixels (SPX2) from the normal direction, no diffracted light emerges from the plurality of second subpixels (SPX2), or second diffracted light having a wavelength equal to that of the first diffracted light emerges from the plurality of second subpixels (SPX2) in a second angular range wider than the first angular range, at an intensity lower than that of the first diffracted light; and the plurality of pixels (PX) are configured to display a continuously changing image using the first diffracted light and the second diffracted light.