3D Authentication Medium With Phase-Shift Cells for Clear Holograms
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Solution Overview
Problem
Existing authentication media, such as ID cards, are vulnerable to tampering and counterfeiting, and existing three-dimensional displays suffer from blurring issues when illuminated with non-point light sources, compromising both anti-counterfeiting and stereoscopic effects.
Innovation Solution
A three-dimensional display is formed by arranging first and second element cells with phase shift structures on a laminate sheet, producing reconstructed images on both sides of the sheet, enhancing stereoscopic effects and anti-counterfeiting properties, and allowing visibility under various lighting conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If laser interference holograms or CGHs with three-dimensional viewing are used to achieve dynamic effects and stronger stereoscopic effects, then the stereoscopic effect is improved, but the reconstructed image becomes blurred when illuminated with non-point light sources
Solution Approach 1:
The authentication medium is divided into multiple element cells arranged in specific patterns. Each element cell contains phase shift structures that independently contribute to the reconstructed image. This segmentation allows the system to maintain image clarity while producing stereoscopic effects, as each segment can be precisely controlled to avoid blurring when illuminated by non-point light sources.
Solution Approach 2:
The invention transitions from conventional two-dimensional holographic displays to three-dimensional displays with depth information. By arranging element cells in three-dimensional space with specific spacing, the system creates reconstructed images that appear at different depths, producing genuine stereoscopic effects while maintaining clarity through precise spatial control of each element.
2Reliability
If conventional hologram foils with simple iridescent diffraction light are used, then the anti-counterfeiting property is improved, but the hologram can be easily counterfeited
Solution Approach 1:
Different element cells are assigned different local properties including phase shift values, transmission characteristics, and spatial arrangements. This creates a heterogeneous structure where each local region contributes differently to the overall reconstructed image. The complexity of coordinating these local properties makes counterfeiting difficult, while the anti-counterfeiting property is enhanced through the unique combination of local characteristics.
Solution Approach 2:
The authentication medium combines multiple types of element cells with different optical properties (phase shift structures, transmission characteristics, spacing) to create a composite holographic system. This composite structure produces reconstructed images that are difficult to replicate, enhancing anti-counterfeiting properties while managing complexity through systematic design of the composite elements.
3Ease of manufacture
If personal information is simply printed on authentication media, then the ease of manufacture is improved, but the authentication medium becomes vulnerable to tampering or counterfeiting
Solution Approach 1:
The invention replaces conventional mechanical printing methods with optical phase modulation techniques. Instead of physically printing information that can be easily copied, the system uses phase shift structures in element cells that require precise optical control and coordination. This substitution maintains manufacturing feasibility while dramatically improving anti-tampering properties through the complexity of the optical system.
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 provides a visually and machine-readable authentication medium with improved anti-counterfeiting and aesthetic properties, achieving clear stereoscopic effects on both sides of the laminate sheet, regardless of illumination conditions.
Implementation Method 1
the first element cells and the second element cells respectively form phase shift structures; a first reconstructed image is produced on a first side of the laminate sheet, at a position apparently separated from the laminate sheet, due to the phase shift structure formed by the first element cells; and a second reconstructed image is produced on a second side of the laminate sheet, at a position apparently separated from the laminate sheet, due to the phase shift structure formed by the second element cells
Implementation Method 2
respective three-dimensional structures are formed with spacers interposed between the first element cells and the second element cells
Implementation Method 3
a reflective layer may be provided on the three-dimensional structure
Data Source
AI summary
A three-dimensional display including a laminate sheet with first element cells with recorded personal identification information, and second element cells carrying an authentication medium with visible personal identification information, including a first region and a second region formed by arranging first element cells and second element cells which form respective phase shift structures; the first element cells and the second element cells arranged in an interleaved manner at a predetermined ratio to form respective three-dimensional structures; the first region and the second region are visible respectively from first and second sides of the laminate sheet; a first reconstructed image is produced on the first side of the laminate sheet due to the phase shift structure formed by the first element cells; and a second reconstructed image is produced on the second side of the laminate sheet due to the phase shift structure formed by the second element cells.