License Plate Security via Diffractive Film and Moiré Verification
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Solution Overview
Problem
Current license plate security solutions are inadequate in preventing the distribution and misuse of false or unauthorized license plates, lacking effective traceability and verification methods.
Innovation Solution
A secure license plate design incorporating a retroreflective film with a diffractive structure, secure personalization printing, and a method for optical verification, including a QR code and lenticular array, to ensure authenticity and traceability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional license plate designs are used, then manufacturing is simple and cost-effective, but security against false plates and traceability are inadequate
Solution Approach 1:
The license plate combines multiple materials and structures including retroreflective film with diffractive optical elements, security inks with specific optical properties, and layered construction. This composite approach creates a plate that is inherently difficult to replicate while maintaining manufacturability through established material processing techniques.
Solution Approach 2:
The patent applies security features selectively to specific regions of the license plate rather than uniformly across the entire plate. The diffractive optical elements, security inks, and holographic elements are positioned in localized areas to provide security verification without requiring the entire plate structure to be complex.
2Reliability
If security features are added to license plates, then authenticity verification is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The security features are integrated into the license plate manufacturing process at early stages. The diffractive optical elements are incorporated into the retroreflective film during film production, and security inks are applied during the standard printing process, allowing security features to be built-in rather than added as separate post-processing steps.
Solution Approach 2:
The retroreflective film serves dual purposes: it provides the necessary retroreflection for nighttime visibility and simultaneously incorporates diffractive optical elements for security verification. This multi-functionality reduces the need for separate security components that would increase manufacturing complexity.
3Difficulty of detecting and measuring
If verification methods are implemented, then detection of false plates is improved, but verification time and process complexity increase
Solution Approach 1:
The license plate incorporates optical elements that change appearance based on viewing angle and lighting conditions. The diffractive structures create angle-dependent color shifts and the security inks exhibit fluorescent or phosphorescent properties under specific lighting, allowing rapid visual verification without requiring complex equipment or time-consuming procedures.
Solution Approach 2:
The patent includes security features that respond to mechanical stimulation such as tactile elements or elements that change appearance when the plate is moved or tilted. This creates dynamic visual effects that are easy to observe during routine inspections and help quickly identify genuine versus counterfeit plates.
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 significantly enhances the security and traceability of license plates, making it difficult to produce or misuse false plates and allows for efficient verification, ensuring the integrity of the registration process.
Implementation Method 1
a retroreflective film (140), in this case secured
Implementation Method 2
a diffractive structure (110), numbered, destructible and partially demetallized
Data Source
Figure 1~2B
Figure 2C~3
Figure 4~6
AI summary
The invention relates to a registration plate (100) for a motor vehicle, comprising: a retro-reflective film (140) in contact with the support either directly or by means of an adhesive layer (160), said film (140) bearing a registration number (210) printed thereon; and a diffractive structure (110) glued to the film. The registration plate (100) also comprises a transparent acrylic plate (130) in contact with the retro-reflective film either directly or by means of an adhesive layer (150), as well as at least one of the following: a secure customised printed element (200) solidly connected to the retro-reflective film or the diffractive structure; and a set (220) of at least two images solidly connected to the retro-reflective film and having a moiré effect, and a lens array (190) affixed directly above the at least two images.