Dual-mode Liquid Crystal Window Frequency Control
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Solution Overview
Problem
Existing smart window technologies can only control either radiant energy flow or privacy, lacking the ability to simultaneously manage both functions effectively.
Innovation Solution
A dual-mode smart switchable liquid crystal window utilizing dielectric and flexoelectric effects, which can switch between transparent, scattering, and absorbing states by applying different frequencies of voltage, thereby controlling both radiant energy flow and privacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-mode smart window technology is used, then either radiant energy flow control or privacy control can be achieved, but both functions cannot be simultaneously controlled
Solution Approach 1:
The patent applies multi-functionality by integrating both radiant energy flow control and privacy control into a single smart window system. The window can operate in multiple modes (transparent, scattering, absorbing) depending on the applied voltage frequency, allowing it to perform both energy control and privacy protection functions simultaneously without requiring separate systems.
Solution Approach 2:
The patent utilizes dynamic switching between different operational modes by applying varying voltage frequencies. The window transitions between transparent state (high frequency voltage), scattering state (low frequency voltage), and absorbing state (DC or low frequency voltage), enabling adaptive response to different control requirements and environmental conditions.
2Adaptability or versatility
If voltage is applied to switch the window state, then privacy or energy control is achieved, but the window cannot maintain both functions simultaneously with a single control signal
Solution Approach 1:
The patent changes the parameter of voltage frequency to achieve different window states. By varying the frequency of the applied voltage (high frequency for transparent state, low frequency for scattering state, DC for absorbing state), the system can switch between different functional modes, providing a simple control mechanism that maintains ease of operation while enabling dual-mode functionality.
3Use of energy by moving object
If the window is made transparent to allow radiant energy flow, then energy efficiency is improved, but privacy protection is lost
Solution Approach 1:
The patent makes the window dynamic by allowing it to switch between transparent and opaque states based on the applied voltage. When high frequency voltage is applied, the window becomes transparent to allow radiant energy flow; when low frequency or DC voltage is applied, it transitions to scattering or absorbing states to provide privacy protection, thus adapting to different operational requirements.
Solution Approach 2:
The patent utilizes periodic voltage application to control window states. By applying periodic voltage at different frequencies, the window can be cycled between transparent and privacy-providing states, allowing dynamic control of the trade-off between energy flow and privacy protection based on real-time needs.
4Object-affected harmful factors
If the window is made opaque to protect privacy, then privacy control is achieved, but radiant energy flow is blocked
Solution Approach 1:
The patent enables the window to dynamically switch between opaque and transparent states through voltage control. When low frequency or DC voltage is applied, the window becomes opaque to protect privacy; when high frequency voltage is applied, it returns to transparent state to allow radiant energy flow, providing adaptive control that prevents permanent blocking of energy.
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 window achieves effective control of radiant energy flow and privacy by transitioning between transparent, scattering, and absorbing states in response to varying voltage frequencies, enhancing energy efficiency and privacy protection.
Implementation Method 1
The switchable liquid crystal window makes use of dielectric and flexoelectric effects. When a low frequency, for example, 50 Hz, voltage is applied, the window is switched to an optical scattering and absorbing state by a flexoelectric effect
Implementation Method 2
When a high frequency, for example, 1 kHz, voltage is applied, the window is switched to an optical absorbing but non-scattering state by a dielectric effect
Implementation Method 3
Guest-host liquid crystals contain dichroic absorbing dyes, which are also elongated molecules. When no voltage is applied, the liquid crystal and dye are parallel to the cell substrate, and thus, are parallel to the polarization of incident light; the materials are optically absorbing
Implementation Method 4
The liquid crystal and doped dye molecules inside the window reorient uniformly under dielectric interactions when a high-frequency voltage is applied
Implementation Method 5
The liquid crystal and doped dye molecules are switched into a micron-sized polydomain structure under flexoelectric interactions when a low-frequency voltage is applied
Data Source
AI summary
A dual-mode switchable liquid-crystal window can control both radiant energy flow and privacy. The modes are selected by using different voltage frequencies. A dichroic dye is doped to enable modulation of transmission of the window. In the absence of an applied voltage, the window is transparent without haze. When a high-frequency (e.g., 1 kHz) voltage is applied, the liquid crystal and doped dye molecules inside the window reorient uniformly under dielectric interactions. The material becomes optically absorbing. The transmittance decreases, but the haze does not change. In this mode, the window can control radiant energy flow through the window. When a low-frequency (50 Hz) voltage is applied, the liquid crystal and doped dye molecules are switched into a micron-sized polydomain structure under flexoelectric interactions. The material becomes optically scattering and absorbing. The scenery behind the window is blocked. In this mode, privacy can be controlled. This dual-mode switchable window is suitable for architectural and automobile windows.