Liquid Crystal Chromatic Aberration Compensation
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Solution Overview
Problem
Liquid crystal elements in optical apparatuses suffer from chromatic aberration when polychromatic light passes through them, leading to blurry images due to the inability to focus different wavelengths at the same focal plane, and this issue is exacerbated by temperature variations.
Innovation Solution
The implementation of an optical apparatus comprising a primary liquid crystal element and at least one secondary liquid crystal element, where the secondary element is arranged on the optical path and has a secondary active material with dispersion properties different from the primary active material. This configuration allows for the generation of secondary optical powers that compensate for the chromatic aberration produced by the primary element, effectively focusing different wavelengths at the same focal point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single liquid crystal element is used to focus polychromatic light, then the device complexity is low, but chromatic aberration occurs causing blurry images
Solution Approach 1:
The patent combines a primary liquid crystal element with at least one secondary liquid crystal element having different dispersion properties. The secondary element compensates for the chromatic aberration produced by the primary element, allowing polychromatic light to be focused at a single focal plane while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent uses composite material principles by combining liquid crystal elements with different active materials that have complementary dispersion characteristics. This allows the system to achieve chromatic aberration compensation similar to achromatic lens pairs but using liquid crystal technology.
2Manufacturing precision
If achromatic pairs or triplets are used to correct chromatic aberration, then image quality improves, but device complexity increases
Solution Approach 1:
The patent changes the parameter of dispersion properties by selecting liquid crystal materials with specific characteristics. The secondary element uses an active material whose dispersion properties are deliberately chosen to compensate for those of the primary element, achieving correction with minimal additional complexity.
3Adaptability or versatility
If a liquid crystal element operates at varying temperatures, then adaptability improves, but chromatic aberration varies causing inconsistent image quality
Solution Approach 1:
The patent uses the secondary liquid crystal element to counterweight or compensate for the temperature-induced chromatic aberration variations of the primary element. The secondary element's different dispersion properties allow it to offset the adverse effects of temperature changes on the primary element's optical performance.
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 solution effectively compensates for chromatic aberration in liquid crystal elements, resulting in sharp, multispectral images by ensuring that light of different wavelengths is focused at the same focal point, even under varying temperature conditions.
Implementation Method 1
A refractive index of an active material 104 of the liquid crystal element 100 varies with a wavelength of light passing therethrough, due to a phenomenon known as dispersion
Implementation Method 2
When the polychromatic light passes through the liquid crystal element, its constituent light having different wavelengths is focused at different focal planes
Implementation Method 3
the first secondary optical power and the second secondary optical power, when produced at the secondary liquid crystal element, compensate for the chromatic aberration produced by the primary liquid crystal element
Data Source
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AI summary
In an optical apparatus (200, 504), a processor(s) (208, 512) is configured to: generate a primary drive signal to drive a primary LC element (204, 508) comprising a primary active material (212) to produce a first primary optical power (OP) for a first design wavelength, wherein there is also produced a second primary OP for a second design wavelength; and generate a secondary drive signal to drive a secondary LC element(s) (206, 510) comprising a secondary active material (210) to produce a first secondary OP for the first design wavelength and a second secondary OP for the second design wavelength, based on said primary OPs, and different dispersion properties of secondary active material and primary active material. The first and second secondary OPs compensate for chromatic aberration produced by the primary LC element on polychromatic light for the first design wavelength and the second design wavelength.