Active Optical Device Dual Refractive Index Layers
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Solution Overview
Problem
Existing optical devices that modulate phase using liquid crystal materials face limitations in increasing refractive index change due to decreased electric field distribution with closer pixel intervals, hindering high-resolution phase modulation.
Innovation Solution
An active optical device with first and second refractive index change layers, each controlled by separate electrodes and voltages, utilizing materials like photorefractive crystals, polymers, or liquid crystals, to independently change refractive indices and modulate light phase, with a dielectric layer and sub-electrodes for enhanced control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the interval between pixels is decreased to increase resolution, then the electric field distribution in areas far from the electrode is decreased, making it difficult to increase the degree of refractive index change
Solution Approach 1:
The device is divided into multiple independent refractive index change layers (first and second layers) positioned at different depths. Each layer can be controlled by separate electrodes, allowing independent refractive index modulation. This segmentation enables the system to achieve high resolution through multiple controlled layers while maintaining sufficient electric field distribution in each layer.
Solution Approach 2:
The patent introduces a vertical dimension by positioning refractive index change layers at different depths (first layer between first and second electrodes, second layer between second and third electrodes). This three-dimensional arrangement allows the system to increase resolution through vertical stacking while maintaining adequate electric field distribution in each layer, overcoming the limitation of planar pixel interval reduction.
2Adaptability or versatility
If multiple refractive index change layers are added to increase phase modulation capability, then the device complexity increases
Solution Approach 1:
Each refractive index change layer serves multiple functions: it provides phase modulation capability, can be independently controlled by separate electrodes, and contributes to high-resolution light path control. The first and second layers work together to achieve enhanced phase modulation versatility while maintaining manageable complexity through standardized layer-electrode configurations.
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
Enables increased light phase difference and efficient phase modulation, allowing for high-resolution control of light paths and potential applications in display units for 2D and 3D imaging.
Implementation Method 1
a first refractive index change layer disposed between the first electrode and the second electrode and in which a refractive index is changed by an electric field
Data Source
AI summary
An active optical device and a display apparatus including the same are provided. The active optical device includes: first to third electrodes that are sequentially disposed spaced apart from one another; a first refractive index change layer disposed between the first electrode and the second electrode and in which a refractive index is changed by an electric field; and a second refractive index change layer disposed between the second electrode and the third electrode and in which a refractive index is changed by an electric field.