Liquid Crystal Optical Modulator with Stepped Structures
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Solution Overview
Problem
Existing optical modulation devices using liquid crystals for 3D image display face complexity in manufacturing and reduced diffraction efficiency due to intricate electrode patterns and alignment processes, which complicate the driving scheme and result in undesired light deflection angles.
Innovation Solution
An optical modulation device with a simplified manufacturing process, featuring a liquid crystal layer between two plates with stepped non-conductive structures and patternless electrodes, allowing for in-plane rotation of liquid crystal molecules to modulate light phase, and enabling efficient diffraction by applying specific voltages for 2D and 3D modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If intricate electrode patterns and alignment processes are used to achieve continuous phase modulation, then the phase modulation capability is improved, but the manufacturing complexity and device complexity increase
Solution Approach 1:
The device is divided into distinct functional regions: a first region with a first alignment direction and a second region with a second alignment direction. This segmentation allows different portions of the liquid crystal layer to be aligned in different directions independently, enabling continuous phase modulation without requiring complex electrode patterns across the entire device.
Solution Approach 2:
Different regions of the liquid crystal layer are given different local alignment properties. The first region has liquid crystal molecules aligned in a first direction while the second region has molecules aligned in a second direction. This local differentiation enables the device to achieve continuous phase modulation by varying the alignment direction across different spatial locations, simplifying the overall manufacturing process.
2Adaptability or versatility
If multiple alignment directions and electrode patterns are implemented, then continuous phase modulation is achieved, but the driving scheme complexity increases
Solution Approach 1:
The liquid crystal layer is segmented into a first region and a second region with different alignment directions. This segmentation allows the device to achieve continuous phase modulation through spatial variation in alignment rather than through complex temporal switching of multiple electrode patterns, thereby simplifying the driving scheme.
3Manufacturing precision
If minute electrode patterns are used for manufacturing, then alignment precision is improved, but the light deflection angle accuracy deteriorates
Solution Approach 1:
Instead of using minute electrode patterns throughout the device, the invention segments the alignment function into two distinct regions with two different alignment directions. This approach achieves the necessary alignment precision through macroscopic regional differentiation rather than microscopic pattern control, thereby maintaining light deflection angle accuracy while reducing manufacturing 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 solution simplifies the manufacturing process and enhances the diffraction efficiency of the optical modulation device, achieving improved light deflection angles and easier driving schemes for both 2D and 3D image displays.
Implementation Method 1
liquid crystal molecules aligned in a vertical alignment (VA) mode... when an electric field is applied, a first lateral side of at least one of the stepped structures may align the liquid crystal molecules in a positive first direction, and a second lateral side of the at least one of the stepped structures may align the liquid crystal molecules in a negative first direction
Implementation Method 2
adjust an in-plane rotation angle of liquid crystal molecules to modulate a phase of light
Implementation Method 3
a direction of incident light can be altered by diffracted light that has been phase modulated... a diffraction grating or prism for altering or diffracting the transmitted light
Data Source
AI summary
An optical modulation device, according to an exemplary embodiment of the present invention, includes first and second plates facing each other, the first and second plates including a plurality of regions, and a liquid crystal layer interposed between the first and second plates, the liquid crystal layer including liquid crystal molecules aligned in a vertical alignment (VA) mode. The first plate includes a non-conductive layer including stepped structures repeatedly arranged in a first direction, a first electrode formed to partially cover the non-conductive layer, and first and second aligners disposed in a second direction different from the first direction, wherein the first and second aligners are aligned in opposite directions with respect to each other. The second plate includes a second electrode.