Optical Modulation Device Using Electric Field Alignment
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Solution Overview
Problem
The existing optical modulation devices using liquid crystals face challenges in aligning liquid crystal molecules uniformly, leading to manufacturing defects and inefficiencies in diffraction efficiency, particularly in large-scale devices like 3D image display systems.
Innovation Solution
An optical modulation device with a driver system that applies voltage gradients to lower and upper electrodes in a specific pattern, controlling the in-plane rotational angle of liquid crystal molecules to achieve continuous phase modulation, thereby simplifying the manufacturing process and reducing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If liquid crystal molecules are aligned using a rubbing process in minutely divided regions, then the optical modulation device can achieve phase modulation, but the aligning process becomes complicated and manufacturing defects occur
Solution Approach 1:
The patent extracts and eliminates the rubbing process from the alignment methodology. Instead of using mechanical rubbing to align liquid crystal molecules in minutely divided regions, the invention uses an electric field applied through electrode patterns to achieve alignment, thereby removing the complicated mechanical alignment step while maintaining alignment uniformity
Solution Approach 2:
The patent replaces the mechanical rubbing system with an electric field-based alignment system. By applying voltage through specifically designed electrode patterns, the liquid crystal molecules are aligned through electrostatic forces rather than mechanical friction, simplifying the manufacturing process while achieving the required alignment precision
2Manufacturing precision
If liquid crystal molecules are aligned in minutely divided regions, then phase modulation can be achieved, but manufacturing time increases and defects occur due to pretilt distribution
Solution Approach 1:
The patent segments the electrode structure into multiple independent electrode regions with different voltage applications. This segmentation allows different zones of the liquid crystal layer to be aligned and modulated independently, achieving precise phase modulation across the entire device without requiring time-consuming sequential alignment of minutely divided regions
Solution Approach 2:
The patent applies preliminary voltage to electrode patterns before the liquid crystal layer is fully processed. This preliminary action pre-aligns the liquid crystal molecules in the desired configuration, eliminating the need for subsequent time-consuming alignment adjustments and reducing manufacturing defects related to pretilt distribution
3Adaptability or versatility
If the optical modulation device is made relatively large to function as lens, diffraction grid, and prism, then versatility is improved, but alignment uniformity becomes more difficult to maintain
Solution Approach 1:
The patent designs a single optical modulation device with electrode patterns that can perform multiple optical functions (lens, diffraction grid, and prism) by varying the voltage applied to different electrode regions. This universal design allows one device to replace multiple specialized components, maintaining alignment uniformity across the entire large-area device while achieving versatile optical functionality
Solution Approach 2:
The patent uses dynamically controllable electrode voltage patterns to change the optical function of the device. By adjusting the voltage distribution across the electrode patterns, the same physical device can dynamically switch between functioning as a lens, diffraction grid, or prism, maintaining alignment uniformity while providing versatile optical capabilities
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 enhances diffraction efficiency, reduces manufacturing time, and eliminates defects by ensuring uniform alignment of liquid crystal molecules, enabling the device to function as a lens, diffraction grid, and prism in various optical applications, including 3D image display.
Implementation Method 1
long axes of liquid crystal molecules aligned by applying an electric field in a liquid crystal layer may rotate and may cause different phase modulation according to a position of the optical modulation device
Implementation Method 2
The phase of the light emitted by passing through the optical modulation device may be determined according to a direction of a long axis of the liquid crystal, for example, an azimuthal angle
Implementation Method 3
A direction of light may be changed by diffraction of the light through phase modulation of the light
Data Source
AI summary
Provided are an optical modulation device and a driving method thereof. The optical modulation device includes an active area and a peripheral area disposed around the active area. A plurality of lower electrodes is disposed in the active area. The plurality of lower electrodes extends in a first direction. The plurality of lower electrodes includes a first lower electrode and a second lower electrode. A driver is configured to apply a driving signal to the first lower electrode and the second lower electrode. The driver includes a first channel connected with an upper end of the first lower electrode, a second channel connected with a lower end of the first lower electrode, a third channel connected with an upper end of the second lower electrode, and a fourth channel connected with a lower end of the second lower electrode.