Tunable Liquid Crystal Lens With 2D Electrode Astigmatism Control
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Solution Overview
Problem
Conventional optical systems lack the ability to provide tunable focal length and astigmatism correction, which is essential for applications like ophthalmic and augmented reality, where dynamic adjustment of optical power and astigmatic axis orientation is required.
Innovation Solution
A tunable liquid crystal Fresnel lens with a two-dimensional distribution of electrodes, including pixelated and segmented electrodes, is used to control the index of refraction of the liquid crystal material, allowing for variable focal lengths and astigmatic power by applying voltages that vary as a function of position, enabling spherical and cylindrical optical powers with adjustable astigmatic axis orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional optical systems are used, then the structure is simple, but the ability to provide tunable focal length and astigmatism correction is lacking
Solution Approach 1:
The patent applies dynamics by making the optical properties of the lens tunable through voltage control. The liquid crystal material's index of refraction can be dynamically adjusted by applying different voltages to the electrode distribution, enabling the focal length and astigmatism correction to be changed on-demand. This transforms a static optical system into a dynamic one that can adapt to different viewing conditions.
Solution Approach 2:
The patent utilizes parameter changes by varying the index of refraction of the liquid crystal material through electrical control. By changing the voltage applied to different regions of the liquid crystal layer, the optical properties (focal length, astigmatism) are adjusted without physical movement or replacement of components. This enables continuous tuning of optical parameters.
2Adaptability or versatility
If a two-dimensional distribution of electrodes is used to control index of refraction, then tunable optical power and astigmatic axis orientation are achieved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the electrode structure into multiple independent elements arranged in a two-dimensional distribution. Instead of a single control electrode, the system uses segmented electrodes that can be independently controlled to create different voltage patterns across the liquid crystal layer. This enables precise control over the index of refraction at different locations, achieving both spherical and cylindrical optical powers.
Solution Approach 2:
The patent transitions from conventional one-dimensional or spherically symmetric electrode arrangements to a two-dimensional electrode distribution. This dimensional change allows independent control of optical properties in different directions (x and y axes), enabling astigmatism correction with adjustable axis orientation. The two-dimensional electrode pattern creates asymmetric voltage distributions that produce cylindrical lens effects.
3Adaptability or versatility
If liquid crystal material with varying index of refraction is used, then dynamic optical adjustment is enabled, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by creating spatial variations in the index of refraction through localized voltage application. Different regions of the liquid crystal material experience different electric fields, causing the index of refraction to vary locally according to the voltage pattern applied to the segmented electrodes. This enables the creation of complex optical profiles (spherical, cylindrical, or combined) within a single homogeneous liquid crystal material layer.
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 provides a flexible optical system capable of dynamic adjustment of focal length and astigmatism correction, enhancing the functionality of ophthalmic and augmented reality applications by offering a range of optical powers and astigmatic corrections.
Implementation Method 1
the index of refraction of the liquid crystal material changes in response to the application of the voltage
Implementation Method 2
liquid crystal materials can provide dynamic matching between the index of refraction of the liquid crystal materials and the materials surrounding the liquid crystal materials
Data Source
AI summary
An optical system includes a first set of electrodes arranged in a concentric pattern and a liquid crystal material in electrical communication with the first set of electrodes. The optical system also includes a second set of electrodes arranged in a two-dimensional pattern and in electrical communication with the liquid crystal material.