Interference Display with Structured Reflection Surfaces
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Solution Overview
Problem
Existing displays used for preventing counterfeiting do not dynamically change their visual effects in response to changes in observation conditions, such as the position of the illumination source or observer, limiting their effectiveness in providing enhanced visual security and decoration.
Innovation Solution
A display structure featuring a reflection layer with first and second reflection surfaces, where the distance between these surfaces determines the color of emitted light, and the arrangement of first reflection surfaces on imaginary lines produces colored light that changes direction and intensity dynamically, unlike isotropic emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a display structure with relief diffraction gratings is used to provide visual effects, then the display can display iridescent images, but the techniques become widely known and counterfeiting possibility increases
Solution Approach 1:
The patent changes the fundamental optical parameter from diffraction-based iridescent imaging to interference-based structural coloring. By controlling the thickness of the light-transmitting resin layer (50-500 nm) and the refractive index difference between resin areas, the display produces specific colors through constructive and destructive interference of reflected light waves, making counterfeiting more difficult while maintaining visual impact
Solution Approach 2:
The patent employs a composite structure combining a relief structure forming layer with a light-transmitting resin layer having spatially varying refractive indexes. This composite approach integrates mechanical relief features with optical material properties to achieve both the desired visual effect and enhanced security against counterfeiting
2Illumination intensity
If a display emits light of a specific color toward a wide area in space, then the visual effect is strong, but the image does not change dynamically with observation conditions
Solution Approach 1:
The patent applies local quality by creating first resin areas and second resin areas with different refractive indexes at specific locations within the light-transmitting resin layer. This spatial variation in optical properties causes different regions to interfere with light differently, producing colors that change dynamically based on the observer's position and illumination conditions, thereby achieving both strong visual effect and adaptability
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 emits colored light that changes dynamically with observation conditions, enhancing visual security and decoration by providing a unique and dynamic visual effect that is difficult to reproduce, thus improving counterfeiting prevention and aesthetic appeal.
Implementation Method 1
emit colored light by interference between light reflected from the first reflection surfaces and light reflected from the second reflection surface
Data Source
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AI summary
In a display, in a plan view facing an obverse surface of a reflection layer, first reflection surfaces are substantially square in shape, and a second reflection surface occupies gaps between adjacent ones of the first reflection surfaces. The distance between the first reflection surfaces and the second reflection surface in the thickness direction of a substrate has an extent that the obverse surface of the reflection layer emit colored light by interference between light reflected from the first reflection surfaces and light reflected from the second reflection surface. In a plan view facing the obverse surface (21s) of the reflection layer (21), more than one of the first reflection surfaces (21a) are located on each of a plurality of imaginary lines (Lv), on a straight line intersecting more than one of the imaginary lines (Lv), distances between adjacent ones of the imaginary lines (Lv) have different extents, the obverse surface (21s) of the reflection layer (21) includes a third display portion and a fourth display portion, the third display portion includes more than one of the first reflection surfaces (21a), the fourth display portion includes more than one of the first reflection surfaces (21a), more than one of the imaginary lines (Lv) are set in each of the third display portion and the fourth display portion, each imaginary line (Lv) is parallel to the other imaginary lines (Lv) in each of the third display portion and the fourth display portion, a direction in which the imaginary lines (Lv) extend in the third display portion is a third direction, a direction in which the imaginary lines (Lv) extend in the fourth display portion is a fourth direction, which differs from the third direction, and the third direction and the fourth direction form an angle of less than or equal to 10°.