Complex Birefringent Medium Inverse Wavelength Dispersibility
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Solution Overview
Problem
Conventional phase difference films struggle to provide optimal phase differences across a wide visible wavelength range, leading to color issues when exposed to white light, and existing methods for achieving inverse wavelength dispersibility are complex, difficult to produce, and limited in material options and synthesis flexibility.
Innovation Solution
A complex birefringent medium is developed by laminating multiple birefringent layers, where the normal line of each layer is in the same plane as its principal axis, allowing for controlled phase difference and wavelength dispersion, enabling inverse wavelength dispersibility and improved viewing angles without the need for precise molecular-level birefringence control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional phase difference films are designed for a specific design central wavelength, then optimal phase difference is achieved at that wavelength, but color issues occur when exposed to white light due to wavelength dispersion
Solution Approach 1:
The patent divides the phase difference film into multiple layers with different birefringence characteristics. Each layer is designed to compensate for the wavelength dispersion of the others, collectively achieving inverse wavelength dispersibility across the visible spectrum while maintaining accurate phase difference control
Solution Approach 2:
The patent uses composite material structures combining different polymer materials with distinct birefringence properties. By selecting materials with appropriate wavelength dispersion characteristics and controlling their layer thicknesses, the composite structure achieves inverse wavelength dispersibility, preventing color issues in white light applications
2Adaptability or versatility
If multiple stretched films are laminated to achieve inverse wavelength dispersibility, then wideband phase difference is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies local quality by assigning specific birefringence characteristics and thicknesses to individual layers based on their position and function. Each layer is optimized with specific material properties and dimensional parameters to contribute differently to the overall inverse wavelength dispersibility, simplifying the design process while achieving wideband performance
Solution Approach 2:
The patent controls key parameters such as layer thickness, birefringence values, and orientation angles to achieve inverse wavelength dispersibility. By systematically adjusting these parameters during the design and manufacturing process, the patent simplifies the lamination structure while maintaining wideband phase difference capabilities
3Manufacturing precision
If precise molecular-level birefringence control is implemented, then phase difference precision is improved, but manufacturing complexity and synthesis difficulty increase
Solution Approach 1:
The patent replaces complex molecular-level birefringence control with a macroscopic approach using multiple layers of conventionally manufactured films. By controlling layer thickness, orientation, and material selection, the patent achieves precise overall birefringence control without requiring sophisticated molecular synthesis, significantly simplifying manufacturing
Solution Approach 2:
The patent achieves the required phase difference precision through the cumulative effect of multiple layers, each contributing a controlled portion of the total birefringence. This partial action approach allows using conventional manufacturing techniques for each layer while achieving precise overall control through systematic design
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
This approach allows for the production of phase difference films with wideband properties and enhanced viewing angles, offering greater freedom in material selection and production simplicity while maintaining mass productivity.
Implementation Method 1
A complex birefringent medium having a structure in which a plurality of birefringent layers are laminated
Data Source
AI summary
The present invention provides a complex birefringent medium, which has the so-called inverse wavelength dispersibility, that is, a wavelength dispersibility capable of giving an optimum phase difference to a light of a wide visible wavelength range, has a wide viewing angle, can be produced by a convenient method and is excellent in a degree of adjusting freedom of inverse wavelength dispersibility and in mass productivity, a polarizing plate and a liquid crystal display device. The complex birefringent medium of the present invention is a complex birefringent medium having a structure in which a plurality of birefringent layers are laminated, wherein in the complex birefringent medium, a phase difference exhibits inverse wavelength dispersibility as the whole of the complex birefringent medium, and wherein when a principal refractive index having the maximum absolute value of a difference from an average value of three principal refractive indexes at a wavelength λ (nm) is designated as a first principal refractive index n1(λ), a normal line of the birefringent layer and a principal axis corresponding to the first principal refractive index n1(550) of the birefringent layer are in the same plane.