Security Document Light Control Layer Personalization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Producing large numbers of unique security devices for embedding in security documents is expensive and time-consuming, hindering efficient personalization and counterfeiting prevention.
Innovation Solution
Modifying the three-dimensional surface structure of a light control layer integrated into security document substrates to create unique optical effects, allowing for individual personalization of security documents without producing multiple unique devices, using methods like digital printing, material addition, or deformation of the light control layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large numbers of unique security devices are produced and embedded in security documents, then security against counterfeiting is improved, but production cost and time increase
Solution Approach 1:
The invention separates the security device into two functional parts: a common light control layer that can be mass-produced and reused, and a colour shifting element that provides the unique security feature. This segmentation allows the light control layer to be produced once and then applied to multiple security documents, eliminating the need to produce entirely unique security devices for each document while maintaining security effectiveness.
Solution Approach 2:
The light control layer is produced and prepared in advance as a reusable component before being applied to individual security documents. This preliminary production of the common structural element enables efficient batch processing and reduces the time and cost associated with producing unique security devices for each document.
2Reliability
If individual personalisation of security documents is implemented, then security is improved, but production time and cost increase
Solution Approach 1:
The invention divides the personalisation process into two stages: mass production of common light control layers, and subsequent individual customization by applying or modifying the colour shifting element on each document. This segmentation enables efficient batch processing of the common elements while allowing rapid individual personalisation without repeating the entire device production process.
Solution Approach 2:
The light control layer serves as a reusable template or copy that can be applied to multiple security documents. Instead of producing entirely unique security devices for each document, the invention uses copies of the common light control layer structure, reducing production time and cost while maintaining the ability to personalise each document through the colour shifting element.
3Reliability
If complex security devices are produced, then security against counterfeiting is improved, but manufacturing complexity increases
Solution Approach 1:
The invention segments the security device into a standardised light control layer with a well-defined optical function and a colour shifting element that provides the unique security feature. This segmentation simplifies manufacturing by allowing the light control layer to be produced using conventional techniques while the colour shifting element can be applied through various methods including printing, lamination, or embossing, reducing overall manufacturing complexity.
Solution Approach 2:
The light control layer is designed as a universal component that can be reused across multiple security documents and combined with different colour shifting elements. This multi-functionality reduces manufacturing complexity by eliminating the need to design and produce entirely unique complex structures for each security document, while still providing high security through the combination of standardised and customised elements.
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
Enables efficient personalization of security documents with unique, difficult-to-counterfeit features, reducing production costs and time while maintaining high security standards.
Implementation Method 1
the optical effect produced by a colour shifting element can be modified by introducing a film comprising a surface relief over the colour shifting element, wherein the surface relief modifies the angle of light incident to, and reflected from, the colour shifting element
Implementation Method 2
the three-dimensional nature of the surface structure of a light control layer in order to control the characteristics of a security device
Implementation Method 3
Such a colour shifting element generates a coloured appearance which changes dependent on the viewing angle. Examples of known colour shifting structures include photonic crystals, liquid crystals, interference pigments, pearlescent pigments, structured interference materials or thin film interference structures including Bragg stacks.
Data Source
Figure 1a~1b
Figure 1c~1d
Figure 2~3
AI summary
A method of forming a security document is provided. The method comprises: providing a security document substrate, the security document substrate comprising a security device comprising a colour shifting element and a light control layer covering at least a part of the colour shifting element, wherein the light control layer has a surface structure comprising one or more elevations and depressions that modifies the angle of light from the colour shifting element to generate a first optical effect, and; selectively modifying a part of the light control layer so as to generate a second optical effect different from the first optical effect.