Active Optical Device Using Local Electrodes for Light Path Control
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Solution Overview
Problem
Existing active optical devices, such as polymer-dispersed liquid crystal (PDLC) devices, require high driving voltages and suffer from scattering phenomena due to liquid crystal droplets, making them impractical for controlling light paths effectively.
Innovation Solution
An active optical device with refractive index variable regions formed on a substrate, using a polymer pattern layer and nanostructured local electrodes to apply a low voltage electric field, allowing for selective control of light paths by varying the refractive index, eliminating the need for high driving voltages and scattering issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polymer-dispersed liquid crystal (PDLC) device is used to control light paths, then the refractive index can be varied, but high driving voltage is required and scattering phenomenon occurs
Solution Approach 1:
The device segments the liquid crystal into discrete droplets dispersed within a polymer matrix, with each droplet independently controllable via local electrodes. This segmentation enables precise spatial control of refractive index while reducing the voltage required compared to bulk liquid crystal systems.
Solution Approach 2:
The patent implements local quality by applying voltage selectively to specific regions through local electrodes, creating spatially varying refractive index distributions. This allows different parts of the device to have different optical properties, enabling complex light path control without requiring high global voltage.
2Reliability
If a polymer-dispersed liquid crystal (PDLC) device is used to control light paths, then the refractive index can be varied, but scattering phenomenon occurs due to liquid crystal droplets
Solution Approach 1:
The patent controls the scattering phenomenon by adjusting parameters such as liquid crystal droplet size, polymer matrix refractive index matching, and applied voltage levels. By optimizing these parameters, the device achieves effective light path control while minimizing unwanted scattering effects that would degrade image quality.
3Adaptability or versatility
If a complicated structure is used to control light paths, then light path control flexibility is improved, but device complexity increases
Solution Approach 1:
The patent employs dynamic control of refractive index through voltage application, allowing the optical properties to be changed in real-time without physical reconfiguration. This dynamic approach provides high adaptability for various light path control scenarios while maintaining a relatively simple fixed structure compared to mechanically reconfigurable systems.
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 achieves efficient modulation of light paths with a low driving voltage, improving diffraction efficiency and preventing scattering, enabling more precise control of light characteristics, such as diffraction, wavelength, and polarization, suitable for applications like holograms and optical recording systems.
Implementation Method 1
a refractive index of liquid crystals varies according to whether an electric field is applied
Data Source
AI summary
An active optical device includes a substrate; a plurality of refractive index variable regions formed on the substrate; and a voltage applier which applies an electric field to the plurality of refractive index variable regions.