Liquid Crystal Phase Modulation with Pre-Switch Voltage Control
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Solution Overview
Problem
Existing phase difference modulation devices require a long time for the refractive state to change due to the slow operation speed of liquid crystal molecules when transitioning between applied and non-applied voltage states.
Innovation Solution
A phase difference modulation device with a control circuit that applies voltage to first, second, and third electrodes to switch the potential of the electrodes, including a higher intermediate potential to accelerate the change in the refractive state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If voltage is applied to the first and second electrodes to change the tilt state of liquid crystal molecules, then the refractive state changes, but the operation speed is slow due to elasticity-dependent molecular movement
Solution Approach 1:
The control circuit applies a preliminary voltage to the first electrode before switching the second electrode's voltage, proactively preparing the liquid crystal molecules for the upcoming state change. This preliminary action reduces the time required for molecules to respond to the final voltage change, directly addressing the slow operation speed issue.
Solution Approach 2:
The patent implements a multi-stage voltage switching sequence with distinct time periods: first applying voltage to the first electrode, then switching the second electrode's voltage. This periodic, staged approach to voltage application accelerates the overall response time compared to a single simultaneous switch, reducing the total time required for refractive state change.
2Loss of time
If a simple voltage switching method is used between two electrodes, then the device structure is simple, but the switching time for refractive state change is long
Solution Approach 1:
The control circuit applies a preliminary voltage to the first electrode before switching the second electrode's voltage, proactively preparing the liquid crystal molecules for the upcoming state change. This preliminary action reduces the time required for molecules to respond to the final voltage change, directly addressing the slow operation speed issue.
Solution Approach 2:
The patent implements a multi-stage voltage switching sequence with distinct time periods: first applying voltage to the first electrode, then switching the second electrode's voltage. This periodic, staged approach to voltage application accelerates the overall response time compared to a single simultaneous switch, reducing the total time required for refractive state change.
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 solution significantly reduces the switching time required for the refractive state change by optimizing the voltage application sequence, enhancing the operational speed of the liquid crystal molecules.
Implementation Method 1
a liquid crystal element configured to refract and emit light
Implementation Method 2
when voltage is applied to a first electrode and a second electrode and the potentials of the first and second electrodes are different from each other, a potential gradient is generated in a high-resistance layer, causing liquid crystal molecules to tilt. In this case, light is refracted due to the tilt of the liquid crystal molecules.
Data Source
AI summary
According to an aspect, a phase difference modulation device includes a first substrate provided with a first electrode and a second electrode adjacent to each other, a second substrate provided with a third electrode overlapping the first and second electrodes, a liquid crystal layer between the first and second substrates, and a control circuit. When switching from a state in which the potential of the first electrode is a first potential and the potential of the second electrode is a second potential higher than the first potential to a state in which the potential of the second electrode is the first potential and the potential of the first electrode is a predetermined potential, the control circuit switches the potential of the first electrode from the first potential to a third potential higher than the predetermined potential and then to the predetermined potential.