Display Member with Anisotropic Grooves for Anti-Counterfeiting
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Solution Overview
Problem
Display members utilizing diffraction structures face challenges in maintaining counterfeiting prevention effectiveness due to the rise in techniques capable of producing similar impressions, reducing their security efficacy.
Innovation Solution
A display member featuring a light transmission layer with pixels that include specific grooves or ridges at defined angles, forming a diffraction structure and anisotropic light-scattering structure, and a metal layer that covers certain regions, allowing for the display of distinct images under different illumination conditions, enhancing counterfeiting prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a diffraction structure is used to display images, then counterfeiting prevention effect is achieved, but the structure becomes vulnerable to imitation techniques that can produce similar impressions
Solution Approach 1:
The display member is divided into multiple distinct regions (first region with first grooves/ridges, second region with second grooves/ridges forming diffraction structure, third flat region, fourth region with third grooves/ridges forming anisotropic light-scattering structure). Each region contributes differently to the overall optical effect, making counterfeiting more difficult as imitators must reproduce multiple distinct structural characteristics simultaneously.
Solution Approach 2:
Different regions of the display member have different local optical properties: the first region provides a specific optical effect with grooves/ridges at -10° to +10° angles, the second region provides diffraction effects with grooves/ridges at -65° to +65° angles, the fourth region provides anisotropic light scattering. This spatial variation in local quality creates a complex overall effect that is difficult to counterfeit.
2Reliability
If multiple regions with different optical structures are implemented, then counterfeiting prevention effect is enhanced, but device complexity increases
Solution Approach 1:
Multiple optical structures (diffraction grating, anisotropic light-scattering structure) are merged into a single integrated display member with multiple regions. The metal layer is formed in a continuous process covering all regions, and the regions are arranged in a systematic pattern within pixels. This merging approach achieves enhanced counterfeiting prevention while controlling overall device complexity through integrated design.
Solution Approach 2:
The display member serves multiple functions simultaneously: it displays images through transmitted light, produces diffraction effects, creates anisotropic light scattering, and provides counterfeiting prevention. The metal layer serves both as a reflective element and as a structural component that defines the regions. This multi-functionality reduces the need for separate components, thereby controlling complexity.
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 member achieves a strong counterfeiting prevention effect by displaying different images when observed under transmitted or diffracted light, ensuring high-quality image display and preventing counterfeiting.
Implementation Method 1
a second region having a plurality of second grooves or ridges which extend in a longitudinal direction in a second angle range of −65° to +65° with respect to a second direction which is parallel to the principal surface and is perpendicular to the first direction, the plurality of second grooves or ridges forming a diffraction structure
Implementation Method 2
a fourth region having a plurality of third grooves or ridges which extend in a longitudinal direction in the second angle range, the plurality of third grooves or ridges forming an anisotropic light-scattering structure
Data Source
Figure 1~2
Figure 3~4
Figure 5A~5C
AI summary
To enable a strong counterfeiting prevention effect to be achieved, a display member of the present invention includes: a light transmission layer having a principal surface including a plurality of pixels; and a metal layer covering the principal surface, one or more of the pixels (PX) include a first region (R1), one or more of the pixels (PX) include a second region (R2), the first region (R1) has a plurality of first grooves or ridges each of which extends in a longitudinal direction in a first angle range of -10° to +10° with respect to a first direction (D1), the second region (R2) has a plurality of second grooves or ridges each of which extends in a longitudinal direction in a second angle range of -65° to +65° with respect to a second direction (D2) perpendicular to the first direction (D1), the second grooves or ridges form a diffraction structure, and the metal layer does not cover at least part of the first region (R1) and covers the second region (R2).