Multi-Layer Light Modulator for Wide Transmission Range
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Solution Overview
Problem
Existing light modulators using particle-based electrophoretic media face limitations in achieving a wide range of transmission states, with most electro-optic media unable to vary transmission from 100% to 0%, limiting their effectiveness in applications such as building and vehicle glazing for energy efficiency and comfort.
Innovation Solution
A light modulator comprising multiple discrete variable transmission electro-optic layers, where light passes successively through the layers, with each layer optimized to satisfy the relationship O≥0.5R+0.5, and typically having an open state transmission of at least 75%, to achieve a higher transmission range than individual layers, and potentially using encapsulated or polymer-dispersed electrophoretic media with electrodes for control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer electro-optic modulator is used, then the device complexity is low, but the transmission range is limited and cannot achieve wide variation from 100% to 0%
Solution Approach 1:
The patent divides the light modulator into multiple discrete electro-optic layers (typically 2-5 layers) stacked in sequence. Each layer independently modulates light transmission, and the combined effect of multiple layers achieves a wide transmission range from nearly 100% to 0%, resolving the limitation of single-layer devices.
Solution Approach 2:
The patent transitions from a single-layer (one-dimensional) structure to a multi-layer (stacked) structure, adding the dimension of layer multiplication. This dimensional change enables the transmission range to be expanded by combining the modulation effects of multiple layers, each contributing a portion of the overall transmission control.
2Measurement precision
If multiple electro-optic layers are stacked to increase transmission range, then the transmission control precision improves, but the device complexity increases
Solution Approach 1:
By segmenting the modulation function across multiple layers, each layer can be optimized for specific transmission ranges. The segmentation allows independent control of each layer, enabling fine-tuned precision in transmission control while distributing the complexity across modular units.
Solution Approach 2:
The patent utilizes parameter changes in each electro-optic layer (such as particle concentration, layer thickness, and material properties) to optimize the transmission characteristics. By adjusting these parameters across multiple layers, the system achieves high transmission control precision without proportionally increasing device complexity.
3Productivity
If electro-optic media with high open state transmission (≥75%) are used, then the light utilization efficiency improves, but the contrast ratio control becomes more challenging
Solution Approach 1:
The segmentation of transmission control across multiple layers allows each layer to operate at high open-state transmission (≥75%) for efficient light utilization. The cumulative effect of multiple high-transmission layers still achieves high contrast ratios, as the closed-state transmission of each layer compounds to produce the desired contrast.
Solution Approach 2:
The patent employs composite electro-optic media within each layer, combining materials with complementary properties to achieve both high open-state transmission and effective contrast control. The multi-layer composite structure allows optimization of light utilization while maintaining contrast ratio through the combined optical properties of all layers.
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 multi-layer configuration significantly increases the transmission range and contrast ratio, enabling more precise control of light transmission and improved energy efficiency, while simplifying driving mechanisms and reducing granularity issues compared to single-layer modulators.
Implementation Method 1
an electrophoretic medium comprising a plurality of electrically charged particles disposed in a fluid and capable of moving through the fluid on application of an electric field to the medium
Data Source
AI summary
A light modulator comprises a plurality of discrete variable transmission electro-optic layers arranged so that light will pass successively through the plurality of layers; the light modulator has a higher transmission range than any of the individual electro-optic layers separately.