Relief Diffractive Structure for Stereoscopic Hologram
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Solution Overview
Problem
Holograms displaying three-dimensional objects, such as persons, animals, plants, and landscapes, are difficult to counterfeit, and existing holograms fail to provide a stereoscopic effect and lifelike facial images, making them susceptible to counterfeiting.
Innovation Solution
A display with a relief structure forming layer featuring a diffractive structure that includes multiple patterns of linear parts with different shapes and arrangements, creating brightness differences to enhance the stereoscopic effect, and a reflective layer covering these patterns to optimize image perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hologram uses a conventional diffractive structure, then it can display an image of a three-dimensional object, but it fails to provide a stereoscopic effect and lifelike images
Solution Approach 1:
The diffractive structure is segmented into multiple regions (first region, second region, third region) with different linear part configurations. Each region contains linear parts with specific patterns (solid lines, dashed lines, dotted lines) that contribute to different brightness levels, collectively creating the stereoscopic effect and lifelike image representation
Solution Approach 2:
Different regions of the diffractive structure are assigned different local qualities through varying linear part arrangements. The first region uses solid line patterns for high brightness, the second region uses dashed line patterns for intermediate brightness, and the third region uses dotted line patterns for low brightness, enabling localized control of image characteristics to achieve stereoscopic perception
2Reliability
If a hologram displays a facial image, then it can verify authenticity, but the facial image does not appear lifelike
Solution Approach 1:
The patent changes the parameters of the diffractive structure by varying the line patterns (solid, dashed, dotted) and their arrangements across different regions. This parameter variation controls the brightness distribution in the diffracted image, enabling the facial image to display realistic brightness gradients and shadows that create a lifelike appearance while maintaining authentication capability
3Ease of manufacture
If the diffractive structure uses simple linear parts, then it is easy to manufacture, but it cannot create brightness differences for stereoscopic effect
Solution Approach 1:
The patent introduces asymmetry in the linear part designs by using three distinct patterns (solid lines, dashed lines, dotted lines) instead of uniform structures. This asymmetric design creates different light diffraction characteristics for each pattern, generating the necessary brightness differences for stereoscopic effect while remaining manufacturable through standard photolithography or laser writing processes
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 effectively provides a stereoscopic effect and lifelike images, making it difficult to counterfeit, as the brightness differences and pattern arrangements enhance observer perception, regardless of observation conditions.
Implementation Method 1
a relief type diffractive structure that displays an image of a three-dimensional object as a diffraction image
Implementation Method 2
a reflective layer at least partially covering a region of the major surface where the diffractive structure is provided
Data Source
Figure 1
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AI summary
There is provided a display that displays a diffraction image from which an observer can easily perceive a stereoscopic effect. A display (1) includes a relief structure forming layer having a major surface which is provided with a relief type diffractive structure that displays an image of a three-dimensional object as a diffraction image; and a reflective layer at least partially covering a region of the major surface where the diffractive structure is provided. The above region includes first and second regions (R1, R2). A portion of the diffractive structure in the first region (R1) includes first and second linear parts forming a first lattice, and first parts arranged in respective gaps of the first lattice. The first and second linear parts each having a solid line shape form a first pattern. A portion of the diffractive structure in the second region (R2) includes third and fourth linear parts alternately arranged in the width direction thereof. The third linear parts each having a dashed line shape and the fourth linear parts each having a dashed or dotted line shape form a second pattern.