Anti-Counterfeiting Display with Sub-Pixel Depth Control
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Solution Overview
Problem
Existing anti-counterfeiting displays using diffraction gratings face challenges in maintaining color consistency across different viewing angles, leading to unintended color expression and image perception issues.
Innovation Solution
A display design featuring sub-pixels with concavo-convex regions and adjustable height or depth of protrusions, allowing for consistent color expression across a wide viewing angle by modulating the area ratio of these regions, thereby ensuring accurate hue and saturation representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional diffraction grating is used to produce iridescent colors, then the anti-counterfeiting effect is enhanced, but the color expression becomes inconsistent across different viewing angles
Solution Approach 1:
The patent divides the display into multiple pixels with different local structures. Each pixel contains sub-pixels with different concavo-convex patterns (different depths, shapes, or arrangements) that are optimized for specific color wavelengths. This local differentiation allows each region to control its color output independently, maintaining color consistency across viewing angles while preserving the iridescent anti-counterfeiting effect.
Solution Approach 2:
The display is segmented into multiple pixels, each further divided into sub-pixels corresponding to different color wavelengths. This segmentation allows independent optimization of each sub-pixel's concavo-convex structure to control diffraction and interference patterns for specific colors, thereby achieving consistent color expression across different viewing angles while maintaining the overall anti-counterfeiting functionality.
2Ease of manufacture
If the relief diffraction grating structure is used, then iridescent colors are produced, but the manufacturing complexity increases due to the need for original plates and metal stampers
Solution Approach 1:
The patent creates master templates with precise concavo-convex patterns that can be repeatedly copied to produce multiple identical display units. These templates encode the specific structural parameters (depth, shape, arrangement) needed to achieve the desired optical effects. By using template-based copying rather than complex multi-step manufacturing processes, the patent simplifies production while maintaining the precision needed for consistent color expression.
3Manufacturing precision
If the area ratio of concavo-convex regions is adjusted to control color expression, then hue and saturation accuracy is improved, but the structural design complexity increases
Solution Approach 1:
The patent systematically varies key parameters of the concavo-convex structures across different sub-pixels, including depth, width, spacing, and arrangement patterns. By controlling these parameters, each sub-pixel is optimized to diffract and interfere light at specific wavelengths, achieving accurate hue and saturation control. The parameter variations follow systematic patterns that can be designed using optical simulation and mathematical models, reducing the perceived complexity through methodical design approaches.
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 achieves a stable full-color image with consistent color representation across various angles, enhancing the anti-counterfeiting effect and making it difficult to counterfeit.
Implementation Method 1
The sub-pixels include concavo-convex regions on a reflective surface of the reflective layer
Implementation Method 2
A display design featuring sub-pixels with concavo-convex regions and adjustable height or depth of protrusions, allowing for consistent color expression across a wide viewing angle
Implementation Method 3
a reflective layer is formed on the resin layer provided with a relief structure by depositing a metal such as aluminum
Data Source
Figure 1(a)~1(b)
Figure 2~3
Figure 4(a)~5
AI summary
The present application discloses a display comprising plural pixels, each of the pixels includes a first sub-pixel, a second sub-pixel, and a third sub-pixel, each of the sub-pixels includes a concavo-convex region on a reflective surface on which incident light is reflected, wherein plural protrusions or recesses are arranged irregularly in the concavo-convex region, characterized in that in the first sub-pixel, the plural protrusions or recesses arranged in the concavo-convex region each have a first height or depth configured to display a first color, the first height or depth is 360 nm ± 40 nm, wherein the saturation of the first color is adjustable by an area ratio of the concavo-convex region in the first sub-pixel, wherein the first color is red, in the second sub-pixel, the plural protrusions or recesses arranged in the concavo-convex region each have a second height or depth configured to display a second color, the second height or depth is 280 nm ± 40 nm, wherein the saturation of the second color is adjustable by an area ratio of the concavo-convex region in the second sub-pixel, wherein the second color is green, and in the third sub-pixel, the plural protrusions or recesses arranged in the concavo-convex region each have a third height or depth configured to display a third color, the third height or depth is 200 nm ± 40 nm, wherein the saturation of the third color is adjustable by an area ratio of the concavo-convex region in the third sub-pixel, wherein the third color is blue.