Light-Controlling Device Electrode Geometry for Transmittance Shielding
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Solution Overview
Problem
Conventional light-controlling devices face challenges in achieving high light transmittance and shielding rates simultaneously, as these properties often have a trade-off relationship, and existing solutions like polymer disperse liquid crystal (PDLC) do not adequately meet the requirements for sufficient light transmittance and shielding.
Innovation Solution
A light-controlling device comprising a first and second substrate with a partition wall and optical medium containing charged particles, where the electrodes are designed to generate an electric field that evenly distributes charged particles, with spreading and collecting electrodes of varying widths and thicknesses to optimize light transmittance and shielding, and a particle guidance member to manage particle distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional light-controlling devices use standard electrode configurations, then the device structure is simple, but the light transmittance and shielding rate cannot be simultaneously optimized
Solution Approach 1:
The patent applies local quality by differentiating electrode characteristics at different locations: spreading electrodes have larger width and smaller thickness to distribute charged particles, while collecting electrodes have smaller width and larger thickness to concentrate particles. This localized differentiation enables simultaneous optimization of light transmittance and shielding rate without complicating the overall device structure.
2Ease of manufacture
If the electrode width and thickness are made uniform, then the manufacturing process is simplified, but the charged particles cannot be evenly distributed
Solution Approach 1:
The patent implements local quality by assigning different width and thickness characteristics to different electrode types. Spreading electrodes are designed with larger width and smaller thickness to facilitate even particle distribution, while collecting electrodes use smaller width and larger thickness for effective particle concentration. This localized parameter variation achieves precise particle control without excessive manufacturing complexity.
3Reliability
If charged particles are concentrated to improve shielding rate, then light blocking performance increases, but light transmittance decreases
Solution Approach 1:
The patent applies dynamics by using voltage-controlled electrode systems to dynamically redistribute charged particles between spreading and collecting electrodes. When voltage is applied, particles move from spreading to collecting electrodes, enabling the device to switch between high transmittance (particles at spreading electrodes) and high shielding (particles at collecting electrodes) states, thus resolving the trade-off between these two properties.
Solution Approach 2:
The patent uses local quality by creating spatially differentiated electrode regions with specific width and thickness characteristics. Spreading electrodes with larger width and smaller thickness provide broad particle distribution for high transmittance, while collecting electrodes with smaller width and larger thickness provide concentrated particle accumulation for high shielding. This localized structural differentiation enables the device to achieve both high transmittance and high shielding rates in different operational states.
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 device achieves improved light transmittance and shielding rates by evenly distributing charged particles, allowing for increased light control without compromising either property, enhancing its application in various light management scenarios.
Implementation Method 1
a plurality of first electrodes and a plurality of second electrodes for generating electrical field to move at least some of the charged particles within the cell
Implementation Method 2
the electric field between the spreading electrodes and the collecting electrode is normalized due to the relative position of the open region and the collecting electrodes. Accordingly, the charged particles can spread more evenly on the spreading electrodes
Data Source
AI summary
A light-controlling device is provided. The light-controlling device includes a first substrate, a second substrate disposed opposite the first substrate, and a partition wall separating the first and second substrates to define a cell. An optical medium containing charged particles is disposed within the cell between the first and second substrates. A plurality of first electrodes is disposed on the first substrate, and a plurality of second electrodes is disposed on the second substrate to generate electrical field within the cell to move at least some of the charged particles. Each of the first electrodes has a first width and a first thickness, and each of the second electrodes has a second width and a second thickness. Each of the second electrodes is disposed at an interval of a third width such that the open region on the second substrate between the second electrodes corresponds to the first electrode on the first substrate.