Birefringent Light Modulator for Independent Phase Amplitude Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional light modulators struggle to independently modulate the phase and amplitude of light waves using a single liquid crystal layer, requiring complex adjustments and low diffraction efficiency, especially for holographic displays which demand precise representation of complex hologram values.
Innovation Solution
A device with regularly arranged controllable light-modulating elements using a birefringent material, where the orientation of optical axes can be independently controlled in two dimensions by external forces such as electric or magnetic fields, allowing for simultaneous phase and amplitude modulation of coherent light waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single liquid crystal layer is used for light modulation, then the device structure is simplified, but the ability to independently modulate phase and amplitude is compromised
Solution Approach 1:
The liquid crystal layer is divided into multiple independently controllable regions or pixels, where each pixel can have its optical axis orientation controlled separately. This segmentation allows independent phase and amplitude modulation at each pixel location while using a single continuous liquid crystal layer, thus resolving the contradiction between structural simplicity and modulation versatility.
Solution Approach 2:
The patent introduces control in an additional dimension by enabling independent adjustment of optical axis orientation in multiple directions or planes within the single liquid crystal layer. This dimensional expansion allows the system to achieve independent phase and amplitude control without requiring multiple separate layers, maintaining structural simplicity while enhancing functionality.
2Ease of manufacture
If conventional light modulators are used for holographic displays, then the implementation is straightforward, but the diffraction efficiency is low
Solution Approach 1:
The patent optimizes specific parameters of the liquid crystal layer, including molecular orientation control, layer thickness, and birefringence characteristics, to maximize diffraction efficiency. By precisely controlling the optical axis orientation and modulation depth, the system achieves higher diffraction efficiency while maintaining the simplicity of a single-layer structure and conventional implementation approach.
3Measurement precision
If multiple light modulators are used to achieve precise hologram representation, then the modulation precision is improved, but the device complexity increases
Solution Approach 1:
The single liquid crystal layer is designed to perform multiple functions simultaneously: it can modulate both phase and amplitude, support various holographic encoding methods, and provide precise control over light properties. This multi-functionality allows one device to replace what would traditionally require multiple specialized modulators, achieving precise hologram representation without increasing device complexity.
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 approach simplifies the modulation of complex hologram values, enhancing the representation of holographic scenes by enabling independent control of phase and amplitude in a single light modulator, improving diffraction efficiency and reducing the need for multiple light modulators or precise adjustments.
Implementation Method 1
a birefringent material in molecular form, wherein a modulation controller controls an orientation of optical axes of the molecules
Implementation Method 2
at least one axis of the molecules is oriented by optical means; at least one axis of the molecules is oriented by generating an electric field; at least one axis of the molecules is oriented by generating a magnetic field
Implementation Method 3
at least one axis of the molecules is oriented by generating an electric field
Implementation Method 4
at least one axis of the molecules is oriented by generating a magnetic field
Implementation Method 5
Wave fronts which are emitted by the holograms of the scene which are encoded on the light modulator means are superimposed in the visibility region
Data Source
AI summary
In known light modulation means, complex phase and amplitude values for modulating light waves are implemented and modulated either separately by two different light modulation means or a light modulation means having two layers of double-refracting materials, leading to increased expenses for material and adjustment. A new device is disclosed that simplifies the modulation of light waves in phase and amplitude in a single light modulation means made of double-refracting material. In a device having regularly disposed, controllable light-modulated elements having a double-refracting material for complex modulation of coherent light waves, and a modulation controller controlling the force-induced alignment of the optical axes of the molecules of the double-refracting material, means are provided for independently aligning the optical axes of the molecules in the light-modulating elements in two dimensions. The alignment can take place by electrical, magnetic, or optical acting means.