Optical Anti-Counterfeiting Element Using Moiré Pixel Sampling
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Solution Overview
Problem
Existing optical anti-counterfeiting technologies face challenges in realizing fine micro-graphic-text coloring due to the intricate structure of micro-graphic-text, making it difficult to achieve effective coloration and visibility, especially in environments with point light sources or natural light.
Innovation Solution
An optical anti-counterfeiting element with a substrate and a sampling layer composed of sampling units aligned with a light-emitting pixel array, utilizing focusing or non-focusing elements to create a moire magnification effect, allowing graphic-text information to be displayed in preset colors on display screens like mobile phones and computers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If micro-graphic-text is colored by scraping ink or filling with microstructures, then color visibility is improved, but manufacturing difficulty increases due to the immensely fine structure (about 2 μm)
Solution Approach 1:
The patent uses a sampling layer with sampling units that copy and magnify the micro-graphic-text structure through optical sampling. Instead of directly coloring the invisible micro-structure, the sampling layer creates a magnified optical copy that can be colored and observed, resolving the contradiction between visibility and manufacturing difficulty
Solution Approach 2:
The patent introduces a new dimensional approach by placing a sampling layer at a different optical dimension (above the substrate) to sample and magnify the micro-structure. This allows the micro-graphic-text to be observed in a magnified form without modifying the original fine structure, avoiding the manufacturing difficulties
2Reliability
If micro-graphic-text structure is made extremely fine (about 2 μm) for anti-counterfeiting, then security is improved, but coloring and visibility become extremely difficult
Solution Approach 1:
The sampling layer creates an optical copy of the micro-graphic-text that is magnified and visible. The original fine micro-structure remains unchanged for security, while the optical copy provides visibility and colorability, resolving the contradiction between security and detectability
Solution Approach 2:
The sampling layer acts as an intermediary between the invisible micro-graphic-text and the human eye. It samples the light from the micro-structure and presents a magnified, colorable version, making the invisible visible without compromising the original security feature
3Loss of information
If sampling units are aligned with light-emitting pixels to show colored graphic-text, then identifiability is improved, but device complexity increases due to precise alignment requirements
Solution Approach 1:
The sampling units are designed to work with standard light-emitting pixel arrays (such as LCD or OLED screens) that are commonly available. By making the sampling layer compatible with universal display technologies, the system achieves color display functionality without requiring specialized or complex alignment mechanisms
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 enhances portability, identifiability, and readability of optical anti-counterfeiting features by enabling the display of preset graphic-text information with moire magnification effects using mobile devices, improving the visibility and clarity of anti-counterfeiting elements.
Implementation Method 1
the sampling unit array is configured for sampling the light-emitting pixel array, so as to show the preset graphic-text information of a single color or comprehensive colors of a plurality of colors among colors of the light-emitting pixels, wherein the light-emitting pixels of the single color or the comprehensive colors of the plurality of colors show a moire magnification effect
Implementation Method 2
each of the sampling units is a focusing element or a non-focusing element... the focusing element is a microlens... a focal length f of the focusing element satisfies the following equation
Data Source
AI summary
Disclosed are an optical anti-counterfeiting element and an anti-counterfeiting product. The optical anti-counterfeiting element includes a substrate; and a sampling layer formed on a first surface of the substrate, wherein the sampling layer is a sampling unit array composed of sampling units distributed according to a preset graphic-text information, the sampling unit array is aligned, in a preset manner, with a light-emitting pixel array positioned on a second surface side of the substrate and composed of light-emitting pixels, and the sampling unit array is configured for sampling the light-emitting pixel array, so as to show the preset graphic-text information of a single color or comprehensive colors of a plurality of colors among colors of the light-emitting pixels, wherein the light-emitting pixels of the single color or the comprehensive colors of the plurality of colors show a moire magnification effect.