Reflective Information Medium With Laser-Removed Anti-Forgery Patterns
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Solution Overview
Problem
Existing methods for forging prevention in information display media, such as watermarks and diffraction gratings, are costly, require complex manufacturing processes, and lack the ability to form patterns on demand, especially in polymeric substrates.
Innovation Solution
An information display medium with a light reflection layer comprising a first region displaying authentication information through an outline shape and a second region displaying identification information by partial removal, utilizing a substrate with uneven structures and a light reflection layer with varying aspect ratios and material density, formed using pulsed laser technology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a liquid crystal display device is miniaturized, then the display size is reduced and portability is improved, but the aperture ratio decreases and display quality deteriorates
Solution Approach 1:
The patent transitions from planar ITO electrodes to three-dimensional conductive oxide nanowire networks, utilizing vertical and radial dimensions to create conductive pathways that maintain high aperture ratios in miniaturized displays. The nanowires form a spatial network that conducts electricity across multiple dimensions rather than relying on flat surface traces.
Solution Approach 2:
The invention changes the physical parameters of the conductive material from bulk ITO films to nanoscale wire networks with diameters of 1-100 nm. This parameter change in material dimensionality and structure enables higher conductivity efficiency at smaller scales, maintaining display quality while reducing device size.
2Illumination intensity
If transparent conducting oxide materials are used, then transparency is improved, but conductivity is insufficient compared to metal oxides
Solution Approach 1:
The patent creates composite conductive oxide nanowire networks combining multiple metal oxide materials (such as ZnO, In2O3, SnO2) to achieve both high transparency and high conductivity. The composite structure leverages the complementary properties of different materials to overcome the limitations of single-material systems.
Solution Approach 2:
The nanowire network provides localized high-conductivity pathways while maintaining overall transparency. The conductive properties are concentrated in the nanowire structures themselves, while the spaces between wires remain transparent, creating local quality differentiation that satisfies both transparency and conductivity requirements.
3Ease of manufacture
If conventional sputtering methods are used, then the manufacturing process is simple, but the material properties cannot be precisely controlled
Solution Approach 1:
The patent employs preliminary actions in the form of precursor solution preparation and controlled drying/curing sequences before final sintering. The multi-step process including spin-coating, drying, and gradual heating allows precise control of nanowire formation and material properties, achieving high precision through preparatory steps that set the foundation for final material characteristics.
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
Enhances forgery prevention by allowing on-demand pattern formation without additional materials, integrating authentication and identification information, and providing visual differentiation through reflectance and transmittance changes.
Implementation Method 1
conductive oxide nanowires... have been attracting attention as materials for transparent electrodes... high conductivity
Implementation Method 2
transparent electrodes... high transparency... conductive oxide nanowires
Data Source
Figure 1~4
Figure 5~7B
Figure 8A~9
AI summary
Provided is an information display medium that can enhance a forgery prevention effect. An information display medium (100) includes a light reflection layer (20) made of a metal or a metallic oxide and partially or fully placed on one surface of a substrate, and the light reflection layer (20) includes a first region (30) where first information is displayed by either of or a combination of an outline shape and a shape of an uneven region, and a second information display region (21a) where identification information formed by partial material removal of the light reflection layer (20), the second information display region being set to partially or fully overlap with the light reflection layer (20) where the first information is displayed in the first region (30) .