Display Body Lattice Lines for Anti-Counterfeiting
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Solution Overview
Problem
Existing display bodies struggle to clearly differentiate between front and oblique views under reduced light conditions, making it difficult to display distinct iridescent and dark images, which is crucial for anti-counterfeiting and decorative purposes.
Innovation Solution
The display body incorporates a lattice structure with lattice lines and protrusions arranged at specific pitches and orientations, utilizing aperiodic and periodic arrangements to enhance brightness and optical effects, with at least part of the plane of incidence made of metal to increase reflectance and suppress light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the amount of light incident on the fine structure is reduced, then the black color in the front view is enhanced, but the brightness of the diffracted light in the oblique view decreases
Solution Approach 1:
The invention introduces lattice lines as a new structural element in addition to the existing protrusions. These lattice lines are arranged in a different dimensional configuration (extending in the X-direction with spacing in the Y-direction) to provide an additional light diffraction path, thereby increasing the overall brightness of diffracted light in the oblique view without compromising the black color effect in the front view.
2Illumination intensity
If the interval between protrusions is made very small (less than or equal to the shortest wavelength of visible light), then the black color effect is enhanced, but the manufacturing precision required increases
Solution Approach 1:
The invention segments the light diffraction function into two separate structural elements: protrusions (which suppress reflection to create black color) and lattice lines (which diffract light to create iridescent color). This segmentation allows each element to have optimized dimensions - the protrusions can maintain very small intervals for effective reflection suppression, while the lattice lines provide the necessary diffraction function with more relaxed manufacturing tolerances.
3Illumination intensity
If both protrusions and lattice lines are arranged with very small intervals, then the dark image brightness is reduced, but the manufacturing complexity increases
Solution Approach 1:
The invention extracts the light diffraction function from the protrusion structure and assigns it to a separate lattice line structure. This allows the protrusions to focus solely on reflection suppression with their very small intervals, while the lattice lines handle light diffraction with their own spacing requirements. The separation of functions reduces the overall manufacturing complexity compared to attempting to achieve both functions through a single complex structure.
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
This configuration allows for a dark image in the front view and a bright, high-brightness image in the oblique view, improving the visibility and authenticity verification of the display body.
Implementation Method 1
the display body forms a bright image by light diffracted by the lattice lines
Implementation Method 2
The protrusions or recesses constituting the fine structure suppress the reflection of light that is incident on the fine structure and display the black color in a front view
Data Source
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AI summary
A display body includes lattice lines that are arranged along a plane of incidence on which light is incident. The lattice lines have properties for forming a bright image with diffracted light of the incident light in an oblique view in which the plane of incidence is viewed obliquely, and absorbing some of the incident light. The surface of each of the lattice lines includes dispersed fine step parts that are repetitive in the direction in which the lattice lines extend. The steps have an antireflection function and form a dark image in a front view directly facing the plane of incidence.