Patterned Conductive Layer for Electrochromic Switching
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Solution Overview
Problem
Conventional smart windows with electrochromic devices experience delayed switching times due to sheet resistance effects in the conductive layers, leading to non-uniform voltage distribution and slower transitions between transmissive states.
Innovation Solution
Incorporating a patterned conductive layer with higher conductivity than the second transparent conductive layer, which partitions the electrochromic device into multiple cells, allowing for a more uniform voltage distribution and reducing switching times by acting as a lower-resistance electrical conduit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a conventional transparent conductive layer is used in smart windows, then the device structure remains simple, but the switching time is delayed due to sheet resistance effects and non-uniform voltage distribution
Solution Approach 1:
The patent divides the electrochromic device into multiple independently controllable cells by introducing a patterned conductive layer with signal generating traces. Each cell can be addressed individually through the conductive pattern, allowing parallel switching operations that reduce overall switching time while maintaining uniform voltage distribution across each cell.
Solution Approach 2:
The patterned conductive layer acts as an intermediary between the transparent conductive layers and the optically active layer. It provides localized voltage generation and distribution, mediating the electrical connection to reduce sheet resistance effects and enable faster, more uniform switching without requiring complete structural redesign.
2Area of stationary object
If the conductive layer area is increased to cover the entire glass pane, then the smart window achieves full coverage, but the voltage distribution becomes non-uniform due to cumulative resistance from perimeter electrical coupling
Solution Approach 1:
The conductive layer is segmented into a patterned structure with distributed signal generating traces across the glass pane surface. This segmentation creates multiple localized voltage sources that independently serve different regions, ensuring uniform voltage distribution across the entire large area while maintaining full coverage for smart window functionality.
Solution Approach 2:
The patterned conductive layer implements local quality by providing region-specific voltage generation and control. Different areas of the glass pane receive optimized electrical coupling through locally positioned conductive traces, allowing each region to maintain stable and uniform voltage distribution tailored to its specific spatial requirements.
3Speed
If higher voltage is applied to overcome sheet resistance, then the switching speed may improve, but the voltage distribution becomes more non-uniform and energy consumption increases
Solution Approach 1:
The voltage application is segmented into multiple localized zones through the patterned conductive layer with distributed traces. Each segment receives optimized voltage delivery directly at the source, reducing the need for high overall voltage to overcome resistance. This enables faster switching through improved local voltage distribution while minimizing energy loss that would occur with uniform high-voltage application across the entire device.
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 patterned conductive layer enables faster and more even transitions between transmissive states by minimizing voltage losses and ensuring uniform voltage distribution across the optically active layer, thus reducing switching times.
Implementation Method 1
The optically active layer is formed of materials whose light transmittance changes in response to applied electric fields. Thus, each applied voltage induces a transmissive state in the optically active layer.
Implementation Method 2
The patterned conductive layer is disposed on the second transparent conductive layer and defining an array on the second transparent conductive layer. The array partitions the electrochromic device into a plurality of electrochromic cells. The patterned conductive layer enables faster and more even transitions between transmissive states by minimizing voltage losses and ensuring uniform voltage distribution across the optically active layer, thus reducing switching times.
Data Source
AI summary
An electrochromic device includes an optically active layer having an optical property that can be altered by application of electrical power to the optically active layer and a conductive structure that is configured to supply the electrical power to the optically active layer. The conductive structure includes patterned conductive elements that cooperate with the optically active layer to define electrochromic cells.