Relief Structure Forgery Prevention Display
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Solution Overview
Problem
The existing techniques for producing relief-type diffraction gratings used in forgery-prevention displays are complex and difficult to manufacture, leading to challenges in achieving a sufficient forgery-prevention effect as they become increasingly used, and the displays relying on iridescent light from diffracted light alone are not effective enough against rising forgery attempts.
Innovation Solution
A display with a layered structure comprising a light-transmitting layer and a reflection layer, featuring a first relief structure with a smooth reflection surface and protrusions or recesses arranged in a specific pattern, which emits diffracted lights of different wavelengths in a narrow angular range, providing a unique visual effect that is difficult to replicate, and a second relief structure that can display achromatic or structural colors, enhancing the forgery-prevention capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a relief-type diffraction grating is used to produce iridescent light effects, then the visual effect is enhanced, but the technique becomes widely recognized and forgeries increase
Solution Approach 1:
The display is divided into multiple diffraction gratings with different grating constants (different groove pitches) arranged in specific patterns. Each grating diffracts light at different angles, creating a composite visual effect that is difficult to replicate. This segmentation approach transforms a single vulnerable technique into a multi-component system that maintains security effectiveness.
2Illumination intensity
If multiple diffraction gratings with different grating constants are arranged to display patterns, then the visual complexity increases, but the manufacturing complexity and difficulty also increase
Solution Approach 1:
The invention uses a master template containing the precise pattern of multiple diffraction gratings. This master is used to create a stamper that can replicate the complex pattern through stamping processes. By copying the design from a single master template to multiple stampers, the manufacturing complexity is reduced while maintaining the visual complexity of the final display.
3Manufacturing precision
If high precision is required to transfer the relief structure from the metallic stamper to the resin layer, then the display quality is improved, but the manufacturing difficulty and cost increase
Solution Approach 1:
The invention performs preliminary actions by first creating a master template with the precise relief structure, then using it to manufacture stampers with the same precision requirements. The actual stamping process benefits from this preliminary preparation, as the stamper already contains the precisely-formed relief structure that will be transferred to the resin layer. This preliminary action separates the precision-critical steps from the volume production steps.
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 high level of forgery prevention by providing a distinctive visual effect that is hard to counterfeit, with the relief structures emitting diffracted lights in a controlled angular range and displaying complex colors, making it difficult for forgers to replicate the exact visual appearance.
Implementation Method 1
the relief structures emitting diffracted lights in a controlled angular range
Implementation Method 2
The display can be formed to display, for example, an image that changes in accordance with observation conditions
Implementation Method 3
a reflection layer, featuring a first relief structure with a smooth reflection surface
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Characteristic visual effects can be achieved. A display (1) includes one or more relief structures (RS1). Each relief structure (RS1) includes a smooth first reflection surface (21) and a plurality of protrusions or recesses. Each top surface of the protrusions or each bottom of the recesses is a smooth second reflection surface parallel to the first reflection surface. Each relief structure (RS1) displays a mixed color as a structural color.