Grid Structure Image for Brilliant, Angle-Stable Diffraction Color
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Solution Overview
Problem
Existing holograms and micro-optical true-color images face issues with poor color brilliance, angle-dependent color shifts, and difficulty in producing bright and stable color representations, especially in security documents.
Innovation Solution
A grating structure image with a brilliance region occupying over 50% of the area, featuring single-channel spectral color fields with the same grating constant and slight azimuthal angular orientation for each eye, combined with multi-channel and micromirror image fields to create a bright, angle-independent color impression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multi-channel additive color mixing is used to create true color holograms, then color variety is improved, but color brilliance deteriorates
Solution Approach 1:
The grating structure image is divided into multiple grating image fields, each dedicated to a specific spectral color with its own grating constant. This segmentation eliminates the need for multi-channel mixing at each pixel, allowing each field to display its color with full brilliance without being diluted by other color channels.
Solution Approach 2:
Different regions of the grating structure image are assigned different spectral color fields with specific grating constants optimized for their respective colors. Each local region has specialized optical properties tailored to its color requirement, maximizing color brilliance in each area while maintaining overall color variety across the entire image.
2Measurement precision
If true color holograms use narrow viewing angle design, then color accuracy is improved, but viewing flexibility deteriorates
Solution Approach 1:
The grating image fields are designed with dynamic color constancy properties that adapt to different viewing angles. By incorporating sub-regions with slightly rotated azimuthal angular orientations for binocular viewing and optimizing grating patterns to maintain color accuracy across a broader angular range, the system dynamically maintains color fidelity regardless of viewing position.
3Stability of the object's composition
If micro-optical true-color images use structural colors, then angle independence is improved, but color brilliance deteriorates
Solution Approach 1:
The patent replaces micro-optical structural color approaches with holographic diffraction gratings. Instead of relying on sub-wavelength structural colors that are inherently pale, the invention uses optically active grating patterns that diffract light to produce vivid spectral colors. This substitution maintains angle independence through proper grating design while dramatically improving color brilliance through diffraction-based color generation.
4Illumination intensity
If spectral color fields use single-channel grating patterns, then color brilliance is improved, but production complexity deteriorates
Solution Approach 1:
The invention varies the grating constant parameter across different grating image fields to generate different spectral colors. By changing this single physical parameter (grating constant) rather than using complex multi-layer structures or multiple gratings, the system achieves diverse spectral colors with high brilliance while maintaining relatively simple production processes suitable for large-scale manufacturing.
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 achieves a highly secure, attractive, and bright appearance with stable color representation over a wide viewing angle, minimizing false colors and enhancing visibility and color stability.
Implementation Method 1
each contain one or more grating patterns made up of a multiplicity of grating lines to produce the desired colour, each of which is characterised by a grating constant and an azimuthal angular orientation
Implementation Method 2
which each contain grating patterns of the same grating constant but with a slightly rotated azimuthal angular orientation in order to produce a color-constant image impression for the two eyes
Data Source
Figure 1~3
Figure 4~6(d)
Figure 7(a)~8(h)
AI summary
The invention relates to a lattice structure image (14) for displaying a multicolored diffraction image, which has a plurality of lattice image fields (20) that glow in a desired color when the lattice structure image (14) is illuminated, and which each contain one or more lattice patterns (26) from a plurality of dash lattice lines to generate the desired color, each of which is characterized by a lattice constant and an azimuthal angular orientation.According to the invention, it is provided that - the lattice structure image (14) contains a brilliance area, the area of which occupies more than 50% of the area of the lattice structure image occupied by lattice image fields (20), wherein - the lattice image fields (20) in the brilliance area consist of spectral color fields (22), each of which contains exclusively lattice patterns of the same lattice constant and which luminesce in one spectral color when illuminated, - at least 8 spectral color fields (22) with different lattice constants are provided in the brilliance area, which luminesce in different spectral colors when illuminated, and - the spectral color fields of the brilliance area are formed by freeform surfaces with irregular and different shapes and sizes.