Display Medium Layer Stack for Viewer-Free Authenticity Verification
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Solution Overview
Problem
Existing display media requiring circular polarizing plates for authenticity determination are costly and difficult for general users to access, necessitating a method for authenticity verification without specialized viewers.
Innovation Solution
A display medium comprising a first layer reflecting one circularly polarized light direction and allowing the opposite, a second phase difference layer, and a third layer reflecting the same direction as the first layer but allowing the opposite, enabling authenticity determination through color observation without special viewers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a display medium using circularly polarized light separation material is used for authenticity determination, then the authenticity verification capability is improved, but the cost increases and special viewers are required
Solution Approach 1:
The invention extracts the circularly polarized light separation function from external viewers and integrates it directly into the display medium itself through the first and third layers. This eliminates the need for separate circular polarizing plates in viewers, allowing authenticity determination to be performed with simple linear polarizing plates instead.
Solution Approach 2:
The invention introduces a phase difference layer as an intermediary component between the first and third layers. This phase difference layer enables the conversion of circularly polarized light separation into observable color differences when viewed through linear polarizing plates, serving as a mediator that translates the optical properties into visible authentication signals.
2Measurement precision
If circular polarizing plates are used for authenticity determination, then the authenticity verification accuracy is improved, but the accessibility for general users deteriorates
Solution Approach 1:
The invention replaces expensive circular polarizing plates with inexpensive linear polarizing plates for authenticity determination. Linear polarizing plates are widely available, much cheaper, and easier for general users to obtain and use, while still maintaining the ability to verify authenticity through color differences.
Solution Approach 2:
The invention changes the observation parameters by using linear polarizing plates instead of circular polarizing plates. By carefully designing the phase difference layer and the arrangement of the first and third layers, the system produces observable color differences when viewed through linear polarizers, maintaining authentication accuracy while improving accessibility.
3Reliability
If a display medium with circularly polarized light separation function is used, then the authenticity verification capability is improved, but the cost of the display medium increases
Solution Approach 1:
The invention makes the display medium itself multi-functional by integrating both the display function and the authenticity verification function into a single structure. The first layer, phase difference layer, and third layer work together to provide both visual display and authentication capabilities, eliminating the need for separate verification components and reducing overall cost.
Solution Approach 2:
The invention uses a composite structure combining the phase difference layer with the first and third layers that have circularly polarized light separation functions. This composite arrangement creates a cost-effective authentication system that leverages the properties of each layer to achieve both display and verification functions without requiring expensive specialized materials throughout the entire 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
Enables authenticity verification of the display medium using unpolarized light, allowing general users to determine authenticity without specialized equipment.
Implementation Method 1
a material having a circularly polarized light separation function is a material having a function of allowing to pass therethrough either one of clockwise circularly polarized light and counterclockwise circularly polarized light, and reflecting part or the entirety of the other circularly polarized light
Implementation Method 2
the second layer is a phase difference layer
Implementation Method 3
the third layer is a layer that is capable of reflecting circularly polarized light whose rotation direction is the rotation direction D1 and allowing to pass therethrough circularly polarized light whose rotation direction is the rotation direction D2
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A display medium including a first layer, a second layer, and a third layer, wherein: a part or an entirety of the first layer, a part or an entirety of the second layer, and a part or an entirety of the third layer are stacked in a thickness direction in this order; the first layer is a layer that is capable of reflecting circularly polarized light having a rotation direction D1 and allowing to pass therethrough circularly polarized light having a rotation direction D2, which is a direction opposite to the rotation direction D1; the second layer is a phase difference layer; and the third layer is a layer that is capable of reflecting circularly polarized light whose rotation direction is the rotation direction D1 and allowing to pass therethrough circularly polarized light whose rotation direction is the rotation direction D2.