Liquid Crystal Lens Phase Distribution for Color Aberration
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Solution Overview
Problem
Liquid crystal lenses used in stereoscopic displays suffer from significant color aberration due to wavelength dispersion, leading to poor stereoscopic image quality in color displays, as they are designed to provide a phase difference distribution of 0 to 2π, which is insufficient to equalize focal lengths for different wavelengths.
Innovation Solution
A liquid crystal lens with a phase difference distribution varying from 0 to 2πβ, where β is an integer of 2 or more, is designed to ensure equal focal lengths for multiple incident beams of different wavelengths, including the fundamental wavelength, thereby reducing color aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a liquid crystal lens is designed with a phase difference distribution of 0 to 2π, then the lens can focus light at a fundamental wavelength, but significant color aberration occurs due to wavelength dispersion affecting different wavelengths differently
Solution Approach 1:
The patent changes the phase difference distribution parameter from the conventional 0 to 2π range to a new range of 0 to 2πβ (where β is an integer greater than 1). This parameter modification allows the liquid crystal lens to equalize focal lengths for multiple wavelengths simultaneously, reducing color aberration while maintaining focusing capability for the fundamental wavelength
Solution Approach 2:
The patent introduces a switchable lens array element that can dynamically change between having lens effect and no lens effect. This dynamic capability allows the system to adapt to different display modes (three-dimensional and two-dimensional) and optimizes performance for different wavelength conditions by switching the phase difference distribution as needed
2Adaptability or versatility
If a switchable lens array element with liquid crystal lens is used to enable mode switching between two-dimensional and three-dimensional display, then display versatility is improved, but device complexity increases
Solution Approach 1:
The liquid crystal lens is designed to serve multiple functions: it can operate as a focusing lens for three-dimensional display mode and as a non-focusing transparent element for two-dimensional display mode. By modifying the phase difference distribution to 0 to 2πβ, it also functions to reduce color aberration. This multi-functionality reduces the need for separate components for each display mode
Solution Approach 2:
The switchable lens array element uses liquid crystal material that can dynamically change its optical properties based on applied voltage. When voltage is applied, the liquid crystal molecules reorient to create the modified phase difference distribution (0 to 2πβ) for three-dimensional mode with color aberration reduction. When voltage is removed, the liquid crystal returns to its initial state, allowing two-dimensional mode operation
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 reduces color aberration in stereoscopic displays by ensuring that focal lengths for various wavelengths are equal, resulting in improved image display quality with reduced color aberration.
Implementation Method 1
liquid crystal molecules having refractive anisotropy to generate a lens effect
Implementation Method 2
form such a phase difference distribution that phase difference with respect to an incident beam of a fundamental wavelength varies from 0 to 2πβ
Implementation Method 3
yield such a lens effect that focal lengths for a plurality of incident beams of different wavelengths including the fundamental wavelength are equal to one another
Data Source
AI summary
A liquid crystal lens is provided and includes a first electrode, a second electrode disposed opposite to the first electrode, and a liquid crystal layer, including liquid crystal molecules having refractive anisotropy, disposed between the first electrode and the second electrode, the liquid crystal molecules being changed in alignment depending on voltage applied by the first electrode and the second electrode, thereby to form such a phase difference distribution that phase difference with respect to an incident beam of a fundamental wavelength varies from 0 to 2πβ along the predetermined direction, β being an integer of 2 or more, and to yield such a lens effect that focal lengths for a plurality of incident beams of different wavelengths including the fundamental wavelength are equal to one another.