Multi-Zone Electrochromic Windows Using Resistive Zone Isolation
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Solution Overview
Problem
Electrochromic windows with multiple tinting zones face challenges in achieving independent operation of zones without physical segmentation, leading to visible scribe lines and compromised functionality, limiting their commercial potential.
Innovation Solution
The implementation of a monolithic electrochromic device with resistive zones and lengthwise variable bus bars allows for independent operation of multiple tinting zones without physical segmentation, using resistive zones to inhibit electron and ion flow and bus bars to create voltage gradients for selective tinting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If physical segmentation (isolation scribes) is used to create multiple tinting zones, then independent operation of zones is achieved, but visible scribe lines appear and device functionality is compromised
Solution Approach 1:
The patent applies segmentation by dividing the monolithic EC device into multiple tinting zones through resistive zones that segment electron and ion flow paths. These resistive zones create electrical isolation between zones without physically cutting through the entire device stack, enabling independent control of each zone while preserving the continuous structural integrity of the EC layers.
Solution Approach 2:
The patent implements local quality by creating resistive zones with specific high-resistance properties at designated boundaries between tinting zones. These localized resistive regions provide electrical isolation precisely where needed between zones, while the rest of the EC device maintains its normal conductive properties and full functionality, avoiding global structural compromises.
2Ease of operation
If the EC device stack is cut through to create separate devices for tinting zones, then independent operation is achieved, but visible scribe lines appear in the viewable area
Solution Approach 1:
The patent transitions from a two-dimensional physical cut approach to a three-dimensional resistive zone approach. Instead of cutting through all layers at a single plane (creating visible scribe lines), the resistive zones are formed by modifying specific layers at controlled depths, creating electrical isolation in the vertical dimension while maintaining optical continuity in the horizontal viewable area.
Solution Approach 2:
The patent replaces the mechanical cutting method (isolation scribes that physically slice through the device) with an electrical field-based approach using resistive zones. This substitution eliminates the need for mechanical segmentation that creates visible defects, using instead controlled electrical resistance variations to achieve zone isolation without compromising optical appearance.
3Illumination intensity
If a monolithic EC device is used without physical segmentation, then no visible scribe lines appear, but independent operation of multiple tinting zones cannot be achieved
Solution Approach 1:
The patent introduces resistive zones as intermediary elements between adjacent tinting zones. These resistive zones act as mediators that control and direct electron and ion flow, enabling independent electrical control of each zone while maintaining the physical continuity and optical uniformity of the monolithic device structure.
Solution Approach 2:
The patent achieves zone isolation by changing the electrical resistance parameter locally at zone boundaries. By creating regions with high electrical resistance (resistive zones) without physically segmenting the device, the patent enables independent operation of tinting zones while preserving the monolithic structure's optical appearance and structural integrity.
4Ease of manufacture
If uniform bus bars are used across the EC device, then manufacturing is simplified, but selective tinting and gradient effects cannot be achieved
Solution Approach 1:
The patent applies local quality to bus bars by creating regions with different electrical properties (high resistance, low resistance, gradient resistance) at specific locations along the bus bar length. This allows the single bus bar structure to provide differentiated electrical control for different zones, enabling selective tinting and gradient effects while maintaining manufacturing simplicity through a unified component.
Solution Approach 2:
The patent achieves versatile tinting control by varying the electrical resistance parameter along the length of the bus bar. By creating zones of different resistance values within the same bus bar structure, the patent enables independent control of multiple tinting zones and gradient effects without requiring multiple separate bus bar components, thus maintaining manufacturing simplicity.
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 electrochromic windows to achieve uniform and customizable tinting without visible scribe lines, maintaining the functional integrity of the device and enhancing energy-saving capabilities by allowing for various tinting schemes and gradient effects.
Implementation Method 1
Electrochromism is a phenomenon in which a material exhibits a reversible electrochemically-mediated change in an optical property when placed in a different electronic state, typically by being subjected to a voltage change.
Implementation Method 2
The two or more tinting zones are separated by a resistive zone which inhibits, at least partially, the flow of electrons, ions or both across the resistive zone.
Implementation Method 3
Bus bars may be composites, having both high electrically conductive regions and resistive regions, configured to enhance tinting fronts and/or promote selective tinting in a particular tinting zone via voltage gradients.
Data Source
AI summary
Thin-film devices, for example, multi-zone electrochromic windows, and methods of manufacturing are described. In certain cases, a multi-zone electrochromic window comprises a monolithic EC device on a transparent substrate and two or more tinting zones, wherein the tinting zones are configured for independent operation.