Liquid Crystal Optical Element for Elliptical Light Distribution
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Solution Overview
Problem
Existing optical elements struggle to control light distribution in both isotropic and anisotropic shapes, particularly in achieving an elliptical shape, which is desired for advanced lighting applications.
Innovation Solution
An optical element comprising multiple stacked liquid crystal cells with comb-shaped transparent electrodes, where specific electrodes are connected to form a network to control light distribution by applying potentials, allowing for the diffusion of light in desired directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional liquid crystal lenses are used to distribute light in a circular shape, then light distribution control is achieved, but the ability to control light distribution in anisotropic shapes (including elliptical shapes) is insufficient
Solution Approach 1:
The liquid crystal cell is divided into multiple regions with different electrode configurations. The first and second transparent electrodes are arranged in a comb shape in a first direction, while the third and fourth transparent electrodes are arranged in a comb shape in a second direction intersecting the first direction. This segmentation allows independent control of light distribution in different directions, enabling both isotropic and anisotropic shape control.
Solution Approach 2:
The patent introduces asymmetric electrode arrangements where the comb-shaped electrodes in the first direction and second direction have different configurations. By applying different potentials to the first/third transparent electrodes and second/fourth transparent electrodes, the system creates asymmetric refractive index distributions that produce elliptical and other anisotropic light distribution shapes.
2Manufacturing precision
If multiple liquid crystal cells are stacked to improve light distribution control, then light distribution precision is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple liquid crystal cells (first, second, third, and fourth liquid crystal cells) into a single integrated optical element. The cells are stacked in series with their liquid crystal layers facing each other, allowing the light to pass through all cells sequentially. This merging approach enables complex light distribution control that would require multiple separate devices, while consolidating them into one compact unit.
3Adaptability or versatility
If polarizing plates are added to achieve elliptical light distribution, then light distribution shape control is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent replaces the mechanical/optical approach of using polarizing plates with an electric field-based approach using comb-shaped transparent electrodes. By applying controlled potentials to the electrode pairs, the liquid crystal molecules are oriented to create the desired refractive index patterns, achieving elliptical light distribution without requiring polarizing plates or other complex optical components.
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 optical element effectively controls light distribution to achieve an elliptical shape by diffusing light in specific directions, maintaining polarization and refracting light as needed, without requiring polarizing plates.
Implementation Method 1
An optical element which is a so-called liquid crystal lens has been conventionally known in which a change in the refractive index of a liquid crystal is utilized by adjusting a voltage applied to the liquid crystal
Implementation Method 2
The first transparent electrode and the fifteenth transparent electrode are electrically connected to each other. The second transparent electrode and the sixteenth transparent electrode are electrically connected to each other...
Data Source
AI summary
An optical element includes first to fourth liquid crystal cells. Each of the first to fourth liquid crystal cells includes a first substrate on which a first pair of comb-shaped transparent electrodes are arranged and a second substrate on which a second pair of comb-shaped transparent electrodes are arranged. An extending direction of the first pair of comb-shaped transparent electrodes is orthogonal to an extending direction of the second pair of comb-shaped transparent electrodes. Between two different liquid crystal cells of the first to fourth liquid crystal cells, one of the first pair of comb-shaped transparent electrodes of one liquid crystal cell and one of the second pair of comb-shaped transparent electrodes of the other liquid crystal cell are electrically connected to each other.