Electrochromic Window Edge Patterning for Charge Isolation
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Solution Overview
Problem
Electrochromic devices, particularly electrochromic windows, suffer from issues such as unwanted coloration and charge buildup in non-viewable areas, which affect performance and introduce defects, and the fabrication process is complicated by the need for isolation scribes and potential short circuits.
Innovation Solution
The method involves patterning and fabricating optical devices by edge deletion and isolation scribes to ensure appropriate isolation, applying edge treatments to layers, and removing portions of conductor layers to prevent charge buildup and sodium ion diffusion, eliminating the need for traditional isolation scribes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional isolation scribes are used to prevent charge buildup and unwanted coloration, then device reliability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent removes the first conductor layer from a perimeter portion of the substrate, extracting the isolation function from traditional scribe structures and replacing it with a simplified geometric configuration. This eliminates the need for complex isolation scribes while maintaining charge buildup prevention and unwanted coloration avoidance.
Solution Approach 2:
Instead of adding isolation scribes to separate functional areas, the patent inverts the approach by removing conductor material from perimeter areas. This negative-space approach achieves isolation and prevents charge buildup without requiring additional structural elements, thereby reducing device complexity.
2Manufacturing precision
If edge deletion and isolation scribes are performed to prevent unwanted coloration and charge buildup, then manufacturing precision is improved, but productivity decreases
Solution Approach 1:
The first conductor layer is removed from the perimeter portion before depositing the electrochromic device layers. This preliminary action establishes precise edge definitions and prevents charge buildup issues before they can affect subsequent manufacturing steps, eliminating the need for post-processing isolation scribes and improving overall fabrication efficiency.
3Object-affected harmful factors
If the first conductor layer is removed from the perimeter area, then harmful factors such as charge buildup and sodium ion diffusion are reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The patent converts the potentially harmful effect of exposed perimeter edges into a beneficial feature by intentionally removing the conductor layer in this region. This prevents charge buildup and sodium ion diffusion that would otherwise occur at edge defects, transforming a vulnerability into a protective design element.
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 approach results in more robust and better-performing electrochromic devices with reduced defects and simplified manufacturing, avoiding unwanted coloration and charge buildup, while maintaining electrical connectivity and preventing short circuits.
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. The optical property is typically one or more of color, transmittance, absorbance, and reflectance.
Implementation Method 2
various edge deletion and isolation scribes are performed
Data Source
Figure 1A~1B
Figure 1C
Figure 1D
AI summary
Thin-film devices, for example electrochromic devices for windows, and methods of manufacturing are described. Particular focus is given to methods of patterning optical devices. Various edge deletion and isolation scribes are performed, for example, to ensure the optical device has appropriate isolation from any edge defects. Methods described herein apply to any thin-film device having one or more material layers sandwiched between two thin film electrical conductor layers. The described methods create novel optical device configurations.