PDLC Glazing Voltage Synchronization to Eliminate Light Flicker
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Glazing units with electrically controllable optical properties exhibit flickering due to mismatched frequencies between applied voltage and ambient light, causing distracting visual effects for observers.
Innovation Solution
A method that adjusts the frequency of the electrical voltage applied to the functional element in glazing units based on the detected frequency of ambient light, using a sensor unit to synchronize the voltage frequency with the light frequency, thereby reducing flickering and maintaining constant transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If AC voltage with fixed frequency (e.g., 50 Hz) is applied to the PDLC functional element, then the functional element can be controlled to change transparency, but flickering or variation in transparency is perceived by observers due to frequency mismatch with ambient light sources
Solution Approach 1:
The patent applies dynamics by making the voltage frequency adjustable and adaptable rather than fixed. The control unit modifies the frequency of the AC voltage applied to the PDLC functional element based on detected ambient light frequency, allowing the system to dynamically respond to changing environmental conditions and eliminate flickering caused by frequency mismatch
Solution Approach 2:
The patent implements feedback by using a sensor unit to detect the frequency of ambient light sources and feeding this information back to the control unit. The control unit then adjusts the voltage frequency accordingly, creating a closed-loop system that continuously optimizes the transparency control to prevent flickering perception
2Object-affected harmful factors
If the voltage frequency is adjusted to match ambient light frequency, then flickering is reduced, but the system complexity increases due to additional sensor unit and frequency detection/control mechanisms
Solution Approach 1:
The control unit serves multiple functions: it generates the AC voltage for PDLC control, detects ambient light frequency through the sensor unit, processes the detected frequency information, and adjusts the voltage frequency accordingly. This multi-functionality reduces the need for separate dedicated components for each function, thereby limiting the increase in overall system 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
The method significantly reduces perceived flickering of the glazing unit's transparency, enhancing its utility and aesthetic appeal by ensuring a virtually constant and flicker-free appearance.
Implementation Method 1
a sensor unit for detecting light beams of a second frequency surrounding the glazing unit
Implementation Method 2
The optical properties of the active layer can be changed by an electrical voltage applied on the flat electrodes
Data Source
AI summary
A method for electrically controlling at least one functional element having electrically controllable optical properties, wherein the optical properties are controlled by a control unit, wherein the control unit is connected to at least two transparent flat electrodes of the functional element, and an electrical voltage is applied between the flat electrodes by the control unit, wherein the electrical voltage has a periodic signal profile with a first, variably adjustable frequency and the glazing unit is surrounded by light beams of a second frequency, and wherein the light beams are sensed by a sensor unit and the first frequency is changed as a function of the second frequency, wherein the first frequency is synchronized with the second frequency.