Liquid Crystal Window Structure for Fast Dimming and Heat Isolation
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Solution Overview
Problem
Existing dimmable windows, particularly those using electrochromic glass, suffer from slow response times, making them inadequate for applications where quick adjustments to tinting are necessary, such as in vehicles that frequently change orientation and exposure to sunlight.
Innovation Solution
A multi-layer structure for dimmable windows comprising a first and second rigid substrate with a liquid crystal (LC) film positioned between them, where the LC film is coupled to one of the substrates and a gap is maintained between the LC film and the other substrate, which can be occupied by a gas or maintained as a vacuum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electrochromic glass is used for dimmable windows, then the window can change optical color or opacity in response to electrical field, but the response time becomes slow (several minutes to more than ten minutes)
Solution Approach 1:
The patent changes the fundamental operating mechanism from electrochromic redox reactions to liquid crystal optical switching. Liquid crystal molecules can reorient rapidly in response to electrical fields, changing the optical properties of the window from transparent to opaque in seconds rather than minutes, thus resolving the slow response time issue.
Solution Approach 2:
The patent replaces the chemical redox mechanism of electrochromic glass with an electrical field-controlled liquid crystal system. The liquid crystal molecules respond to electrical fields by changing their molecular orientation, which directly controls light transmission without involving slow chemical reactions, achieving rapid dimming and undimming.
2Temperature
If a gap is maintained between the LC film and substrate, then thermal isolation is provided to protect against excessive heat, but the structural complexity increases
Solution Approach 1:
The patent divides the window structure into multiple separate layers: outer substrate, gap space, LC film, and inner substrate. This segmentation creates thermal isolation zones between layers, preventing excessive heat from the outer substrate from directly transferring to the inner substrate, while maintaining structural integrity through the distributed layer configuration.
Solution Approach 2:
The gap between substrates acts as a thermal intermediary or insulator. This air or vacuum gap serves as a thermal break that reduces heat conduction from the exterior-facing substrate to the interior-facing substrate, protecting against excessive heat while allowing the LC film to function independently.
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 solution enables rapid dynamic adjustment of tinting levels, addressing the slow response times of existing technologies, and provides thermal isolation to protect against excessive heat from sunlight.
Implementation Method 1
a liquid crystal (LC) film positioned within the separation between the first rigid substrate and the second rigid substrate
Implementation Method 2
the gap is not occupied by a solid material or a liquid material... provides thermal isolation to protect against excessive heat from sunlight
Data Source
AI summary
An apparatus having a multi-layer structure for providing a dimmable window operation is provided. The apparatus includes a first rigid substrate; a second rigid substrate coupled to the first rigid substrate at a perimeter region of the multi-layer structure, to maintain a separation between the first rigid substrate and the second rigid substrate; and a liquid crystal (LC) film positioned within the separation between the first rigid substrate and the second rigid substrate. The LC film is coupled to either the first rigid substrate or the second rigid substrate at an inner region of the multi-layer structure to define a gap between the LC film and another one of the first rigid substrate and the second rigid substrate. The gap is not occupied by a solid material or a liquid material.