Multiple-Image Display Body with Contamination-Resistant Barrier
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Solution Overview
Problem
Existing multiple-image display bodies for ID cards, passports, and banknotes face challenges with contamination of the outermost layer by liquids, leading to loss of anti-counterfeiting effects and insufficient contrast when viewed with reflection light.
Innovation Solution
A multiple-image display body comprising a spacer layer, a line tone barrier layer with alternating transparent and absorptive regions, and a multiple-image formation layer with scattering and absorptive regions, which maintains image visibility and contrast even when contaminated and viewed with reflection light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lens array is used in the outermost surface layer to achieve high anti-counterfeiting effect, then continuous movement and depth in display are improved, but the lens layer becomes vulnerable to contamination by liquids causing loss of lens effect
Solution Approach 1:
A protective layer is introduced as an intermediary between the outer environment and the lens array. This protective layer is designed to be resistant to liquid contamination while allowing optical waves to pass through, thereby protecting the lens array from oil and chemical contamination without significantly reducing light intensity or affecting the anti-counterfeiting display effect
2Object-affected harmful factors
If a line tone barrier layer is used as outermost layer to protect against contamination, then resistance to liquid contamination is improved, but light intensity is reduced making multiple images difficult to recognize
Solution Approach 1:
The protective layer serves as a mediator that provides contamination resistance while maintaining high optical transmission. It is positioned between the contaminated environment and the optical layers, allowing light to pass through to the line tone barrier layer and multiple-image formation layer without significant intensity loss
Solution Approach 2:
The protective layer is designed with specific local properties: it is positioned only at the outermost surface where contamination occurs, and its thickness and material composition are optimized to provide maximum contamination resistance while minimizing light absorption. This localized approach ensures protection is applied only where needed without unnecessarily reducing overall light intensity
3Reliability
If the outermost layer is designed to resist contamination, then reliability under contamination conditions is improved, but contrast under reflection light becomes insufficient
Solution Approach 1:
The protective layer is designed as an optical intermediary that maintains high transmission characteristics for reflection light. By optimizing its material properties and thickness, it allows sufficient light to reach the multiple-image formation layer and return to the observer, preserving contrast even when the outer surface is contaminated with liquids
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 ensures continuous movement and depth in images, maintaining high contrast and visibility under reflection light conditions, even when the outermost layer is contaminated, thus enhancing anti-counterfeiting capabilities.
Implementation Method 1
The line tone barrier layer includes first regions, which transmit electromagnetic waves in at least some wavelength ranges, and second regions, which absorb electromagnetic waves in at least some wavelength ranges
Implementation Method 2
Each of the images includes a third region, which scatters electromagnetic waves in at least some wavelength ranges
Implementation Method 3
a fourth region, which absorbs electromagnetic waves in at least some wavelength ranges
Implementation Method 4
The spacer layer has the form of a thin film. A line tone barrier layer is stacked on the first surface of the spacer layer. A multiple-image formation layer is stacked on the second surface of the spacer layer
Data Source
Figure 1~2
Figure 3A~3C
Figure 4~7
AI summary
A multiple-image display body (1) comprises a thin-film spacer layer (2), a parallel-line barrier layer (3), and a multiple-image forming layer (4). The parallel-line barrier layer (3) has a plurality of first regions (5) which transmits electromagnetic waves in at least a certain wavelength region, and a plurality of second regions (6) which absorbs electromagnetic waves in at least a certain wavelength region, and the plurality of second regions (6) has a parallel-line shape. The multiple-image forming layer (4) has a plurality of images (7 - 9) that can be viewed by observation from a plurality of specific angles through the first regions (5) of the parallel-line barrier layer (3), and each of the images (7 - 9) includes a third region (10) which scatters electromagnetic waves in at least a certain wavelength region and a fourth region (11) which absorbs electromagnetic waves in at least a certain wavelength region. The images (7 - 9) are formed by contrast due to the area ratio between the third region (10) and the fourth region (11).