Birefringence Media for Linear Polarization Tendency
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Solution Overview
Problem
Current color-generation devices using polarization of light struggle to produce high chroma and varied colors, particularly when light waves have circular or elliptical polarizations near to circular polarizations, as they fail to enhance the tendency of linear polarization effectively.
Innovation Solution
A color-generation device comprising a first and second birefringence medium, arranged in series, with specific phase retardation and principal axis orientations to increase the tendency of linear polarization, ensuring that linearly polarized light passes through them, enhancing the polarization directions according to wavelengths and improving color generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If circular or elliptical polarizations near to circular polarizations are used, then the device can operate with simple structure, but the chroma and variety of generated colors deteriorate
Solution Approach 1:
The patent transforms the polarization state parameter from circular/elliptical to linear by introducing birefringence media with specific phase retardation (600-1400 nm) and principal axis orientations. This parameter change enables the generation of multiple linear polarization directions according to wavelengths, thereby improving chroma and color variety without significantly increasing device complexity
Solution Approach 2:
The patent uses composite optical structures combining polarizing means with multiple birefringence media having different phase retardation characteristics and principal axis orientations. This composite approach creates a system that converts circular/elliptical polarization into multiple linear polarization states, resolving the contradiction between structural simplicity and color quality
2Illumination intensity
If the polarization directions of different wavelengths are made more different from one another, then various colors and improved chroma are generated, but the device complexity increases
Solution Approach 1:
The patent achieves different polarization directions for different wavelengths by changing the phase retardation parameter of birefringence media to specific ranges (600-1400 nm for first medium, 100-180 nm for second medium) and optimizing principal axis orientations. This parameter optimization creates wavelength-dependent linear polarization directions, improving color variety while controlling device complexity through precise parameter selection rather than adding numerous components
Solution Approach 2:
The patent segments the wavelength-dependent polarization control function across multiple birefringence media with different phase retardation characteristics. The first birefringence medium (600-1400 nm) and second birefringence medium (100-180 nm) work together to create distinct linear polarization directions for different wavelengths, achieving spectral separation of polarization states without requiring a complex multi-component system
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 device effectively increases the tendency of linear polarization, leading to improved chroma and generation of various colors by optimizing the phase retardation and alignment of birefringence media, resulting in enhanced color display quality.
Implementation Method 1
a first birefringence medium and a second birefringence medium which are in the form of film, sheet or plate and excludes liquid crystal
Implementation Method 2
phase retardation of the first birefringence medium is between 600 nm and 1400 nm with respect to visible light waves (400 nm to 700 nm)
Data Source
AI summary
A color generation device 1000 according to the present invention has a light source 8, and also has a linear polarizing means 10, a first birefringence medium 30a and a second birefringence medium 30b attached to each other in sequence in front of the light source 8. A display means 500 is provided which is distanced from the linear polarizing means 10, the first birefringence medium 30a and a second birefringence medium 30b. The first birefringence means 30a is arranged for the principal axes thereof to be at angle of 45° or −45° with respect to the polarization direction a1 of the linear polarizing means 10 and the second birefringence medium 30b is arranged for the principal axes thereof to be the same as or perpendicular to polarization direction a1 of the linear polarizing means 10 and quarter wave plate is used therefor.