Optically Anisotropic Laminate for Polarized Sunglass Coloring
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Solution Overview
Problem
Image display devices with optically anisotropic films suffer from coloring issues when viewed through polarized sunglasses due to wavelength-dependent conversion of linearly polarized light, leading to incomplete circular polarization and reduced visibility.
Innovation Solution
An optically anisotropic layered body comprising a first and second optically anisotropic layer with specific in-plane retardation values at different wavelengths, ensuring uniform conversion of linearly polarized light to circularly polarized light across the visible spectrum, thereby minimizing coloring effects when viewed through polarized sunglasses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a prior-art optically anisotropic film with forward wavelength dispersion is used to convert linearly polarized light into circularly polarized light, then the image can be displayed with linearly polarized light, but the image becomes dark and unrecognizable when viewed through polarized sunglasses due to unintended coloring
Solution Approach 1:
The patent divides the optically anisotropic film into multiple layers (first optically anisotropic layer and second optically anisotropic layer) with different in-plane retardation characteristics. Each layer has specifically controlled in-plane retardation values at different wavelengths (450nm, 550nm, 650nm), allowing independent optimization of wavelength-dependent optical properties to suppress coloring while maintaining brightness
Solution Approach 2:
The patent changes the in-plane retardation parameters of the optically anisotropic layers to achieve reverse wavelength dispersion characteristics. By controlling the in-plane retardation values Re(H450), Re(H550), Re(H650) of the first layer and Re(Q450), Re(Q550), Re(Q650) of the second layer to satisfy specific relationships, the system achieves uniform circular polarization across the visible spectrum, eliminating the coloring effect when viewed through polarized sunglasses
2Ease of manufacture
If a stretched film with in-plane retardation having forward wavelength dispersion is used as an optically anisotropic film, then the film can be easily manufactured, but the linearly polarized light is converted into deformed circularly polarized light (elliptically polarized light) depending on wavelength, causing coloring
Solution Approach 1:
The patent uses a composite structure of two different optically anisotropic layers, where the first layer and second layer have complementary in-plane retardation characteristics. This composite approach allows the use of commercially available stretched films (which have forward wavelength dispersion) while compensating for their optical deficiencies through the combined effect of multiple layers with specifically designed retardation values
Solution Approach 2:
The patent applies different in-plane retardation characteristics to different layers: the first optically anisotropic layer has higher in-plane retardation values at shorter wavelengths, while the second layer has lower in-plane retardation values at shorter wavelengths. This local differentiation of optical properties across layers enables precise control of the overall wavelength-dependent polarization conversion, achieving uniform circular polarization without requiring uniform material composition throughout
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 solution effectively suppresses coloring on the display surface when viewed through polarized sunglasses, ensuring consistent visibility and reduced reflection of external light, enhancing the performance of image display devices.
Implementation Method 1
an optically anisotropic layered body including a first optically anisotropic layer and a second optically anisotropic layer... in-plane retardations Re(H450), Re(H550), Re(H590), and Re(H650) of the first optically anisotropic layer... in-plane retardations Re(Q450), Re(Q550), Re(Q590), and Re(Q650) of the second optically anisotropic layer
Data Source
AI summary
An optically anisotropic layered body including a first optically anisotropic layer and a second optically anisotropic layer, wherein in-plane retardations Re(H450), Re(H550), Re(H590), and Re(H650) of the first optically anisotropic layer at wavelengths of 450 nm, 550 nm, 590 nm, and 650 nm, respectively, and in-plane retardations Re(Q450), Re(Q550), Re(Q590), and Re(Q650) of the second optically anisotropic layer at wavelengths of 450 nm, 550 nm, 590 nm, and 650 nm, respectively, satisfy specific requirements.