Polymer Dispersion Liquid Crystal Driving Circuit for Low Power
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Solution Overview
Problem
Conventional polymer dispersion type liquid crystal devices have high power consumption and instability due to the use of commercial AC power supplies, with varying frequencies and unstable voltages.
Innovation Solution
A polymer dispersion type liquid crystal device with a pair of transparent substrates, transparent electrodes, and a liquid crystal layer, driven by a circuit that applies periodically inverting direct current voltage between the electrodes to switch between scattering and non-scattering states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If commercial AC power supply is used to drive the liquid crystal panel, then the device can be easily operated in homes and offices, but the power consumption becomes large and environmental load increases
Solution Approach 1:
The patent changes the driving voltage parameters from commercial AC (50/60Hz) to low-frequency square wave AC with adjustable frequency (0.1-100Hz) and optimized voltage amplitude (10-100V). This parameter optimization reduces power consumption while maintaining ease of operation through the driving circuit that generates optimized waveforms.
Solution Approach 2:
The patent employs periodic square wave voltage application with optimized frequency and duty cycle to drive the liquid crystal panel. The periodic inversion of polarity at optimized intervals achieves effective liquid crystal switching with reduced energy consumption compared to continuous commercial AC driving.
2Ease of operation
If commercial AC power supply is used to drive the liquid crystal panel, then the device can be easily operated in homes and offices, but the voltage becomes unstable and frequency varies by region
Solution Approach 1:
The patent introduces a driving circuit as an intermediary between the power source and liquid crystal panel. This circuit generates standardized square wave signals with stable frequency and voltage, isolating the panel from commercial AC variations and ensuring consistent operation across different regions and power sources.
Solution Approach 2:
The patent transforms unstable commercial AC parameters into stable, controlled square wave parameters through the driving circuit. The circuit maintains constant frequency (0.1-100Hz) and voltage amplitude (10-100V) regardless of input variations, ensuring reliable panel operation.
3Speed
If high frequency AC is used to drive the liquid crystal panel, then the response speed is fast, but the power consumption increases
Solution Approach 1:
The patent uses periodic square wave voltage with optimized frequency (0.1-100Hz) and duty cycle to achieve effective liquid crystal switching. The square wave's sharp edges provide fast response while the optimized frequency and periodic nature reduce overall power consumption compared to high-frequency continuous AC.
Solution Approach 2:
The patent optimizes the voltage waveform parameters including frequency (0.1-100Hz), amplitude (10-100V), and duty cycle to achieve the best balance between response speed and power consumption. The square wave shape provides fast transitions while the optimized parameters minimize energy usage.
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 enables low power consumption and stable operation, reducing environmental impact and ensuring consistent performance.
Implementation Method 1
liquid crystal molecules are arranged irregularly, i.e. the liquid crystal panel is in a state in which light is scattered (scattering state)
Implementation Method 2
when an alternating current is applied to the pair of transparent electrodes, the liquid crystal molecules contained in the polymer dispersion type liquid crystal are arranged regularly, and the liquid crystal panel becomes a state in which light is transmitted through the panel (non-scattering state)
Data Source
AI summary
A polymer dispersion type liquid crystal device includes a pair of transparent substrates; a pair of transparent electrodes provided between the pair of transparent substrates; a liquid crystal layer formed by filling a polymer dispersion type liquid crystal between the pair of transparent electrodes; and a driving circuit that applies a voltage between the pair of transparent electrodes to set the liquid crystal layer to a non-scattering state or a scattering state. The driving circuit applies a direct current voltage that periodically inverts a polarity between the pair of transparent electrodes.