Switchable Optical Element Substrate Breakage Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Smart windows with liquid crystal switchable layers face challenges in detecting breakage of substrates, as toughened glass, used for safety, is not flat enough to maintain uniform optical properties and can cause optical imperfections, and laminating alarm glass for breakage detection complicates the window and is aesthetically undesirable.
Innovation Solution
A method involving measuring changes in differential signals, capacitance, resistance, or current applied to the switchable optical element using electrodes and test signals to detect substrate breakage, allowing for reliable detection without additional layers, using variants that include active and passive measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If toughened glass is used for substrate to provide safety and breakage detection capability, then reliability is improved, but manufacturing precision deteriorates due to non-flat surface causing optical imperfections
Solution Approach 1:
The patent separates the safety glass function from the optical function by using two distinct substrate layers: a first substrate optimized for optical quality (flat, transparent) and a second substrate made of toughened safety glass. This segmentation allows each layer to fulfill its specific function without compromising the other, resolving the contradiction between safety reliability and optical manufacturing precision.
Solution Approach 2:
The patent introduces an intermediary detection system consisting of electrodes and evaluation circuitry that electrically monitors the integrity of the toughened glass substrate. This intermediary detection mechanism enables breakage detection without requiring the toughened glass itself to provide the detection function, allowing the use of non-flat safety glass while maintaining detection capability through the intermediate electrical monitoring system.
2Reliability
If alarm glass with integrated circuit is laminated to detect breakage, then reliability is improved, but device complexity increases and aesthetic appearance deteriorates
Solution Approach 1:
The patent merges the breakage detection function directly into the second substrate layer by coating electrodes directly onto the toughened glass surface. This integration eliminates the need for separate alarm glass laminates with embedded circuits, reducing overall device complexity while maintaining breakage detection capability. The detection functionality is combined with the structural safety glass layer itself.
Solution Approach 2:
The second substrate serves multiple functions simultaneously: it provides mechanical safety through toughened glass properties, enables breakage detection through integrated electrodes, and maintains aesthetic appearance by being visually integrated with the overall window structure. This multi-functionality reduces the need for additional separate components.
3Reliability
If alarm glass is laminated for breakage detection, then reliability is improved, but loss of substance increases due to additional layers and materials
Solution Approach 1:
The patent extracts the detection functionality from separate alarm glass laminates and integrates it directly into the existing second substrate layer. By taking out the detection function and embedding it within the structural layer itself, the patent eliminates the need for additional laminate materials, reducing material loss while maintaining detection reliability.
4Reliability
If toughened glass is used for substrate, then reliability is improved, but manufacturing precision deteriorates causing optical imperfections
Solution Approach 1:
The patent divides the substrate system into two specialized layers: the first substrate is manufactured with high optical precision for light transmission, while the second substrate is made of toughened glass optimized for safety and breakage detection. This segmentation allows each component to be optimized for its specific function without compromise.
Solution Approach 2:
The patent applies different quality requirements to different parts of the system: the first substrate requires high optical uniformity and flatness for light transmission, while the second substrate requires high mechanical strength and fracture characteristics for safety. Each substrate is manufactured with local quality optimized for its specific function.
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
Enables reliable detection of substrate breakage and malfunctions in smart windows, improving their reliability and aesthetic appeal by avoiding the need for additional layers, while ensuring detection of damages affecting either substrate layer.
Implementation Method 1
measuring a change in capacitance between the two substrates
Implementation Method 2
measuring a change in resistance of at least one of the substrates
Implementation Method 3
applying an electric field between the first electrode and the second electrode by applying a test signal
Data Source
AI summary
A switchable optical element and method for detecting breakage of a substrate (A, B) of at least one switchable optical element (10) having a first substrate (A) and a second substrate (B), the first substrate (A) being coated with a first electrode and the second substrate (B) being coated with a second electrode, and a switchable layer (14), the switchable layer (14) being sandwiched between the first substrate (A) and second substrate (B), the first electrode and second electrode each having at least one contact, byi) measuring a change in a differential signal measured at two contacts of a substrate (A, B),ii) measuring a change in capacitance between the two substrates (A, B),iii) measuring a change in resistance of at least one of the substrates (A, B),iv) measuring a change in current applied to the switchable optical element (10).