Polyfluoroaromatic Liquid Lens for Electrowetting
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Solution Overview
Problem
Existing non-conductive liquids for electrowetting liquid lenses are costly and have limited miscibility with other substances, making it difficult to achieve the desired properties of density and index of refraction, and they lack hydrolytic stability.
Innovation Solution
A non-conductive liquid comprising a polyfluoroaromatic compound represented by the formula Fx—(aromatic)—Y—R1, where x is between 2 to 5, Y is chosen from CH2, Si(Alk)2, Ge(Alk)2, O, or S, and R1 is any organic group, offering tunable density and index of refraction, improved miscibility, and high hydrolytic stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organogermane compounds are used as non-conductive liquid, then the liquid lens can be formulated, but the cost increases significantly
Solution Approach 1:
The patent changes the chemical composition parameters by replacing organogermane compounds with polyfluoroaromatic compounds that have similar density and refractive index properties but lower cost and better manufacturability
Solution Approach 2:
The patent substitutes expensive organogermane compounds with more economical polyfluoroaromatic compounds, achieving the same functional requirements at reduced material cost
2Reliability
If perfluorinated alkanes are used as non-conductive liquid, then the liquid lens can be formulated, but the miscibility with other substances is limited
Solution Approach 1:
The patent changes the chemical structure parameters by replacing perfluorinated alkanes with polyfluoroaromatic compounds containing aromatic rings and various functional groups (ether, ester, amide), which provide better miscibility with other substances while maintaining the required density and refractive index
Solution Approach 2:
The patent creates a composite non-conductive liquid by combining polyfluoroaromatic compounds with other compatible substances, achieving desired optical properties and improved miscibility through material composition
3Ease of operation
If existing non-conductive liquids are used, then the liquid lens can operate, but they lack hydrolytic stability
Solution Approach 1:
The patent changes the chemical stability parameters by selecting polyfluoroaromatic compounds with fluorinated aromatic rings and stable functional groups (ether, ester, amide) that resist hydrolysis, thereby improving hydrolytic stability while maintaining operational performance
Solution Approach 2:
The patent replaces unstable non-conductive liquids with hydrolytically stable polyfluoroaromatic compounds, extending the operational lifespan and reliability of the liquid lens
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 polyfluoroaromatic compound-based liquid lens exhibits increased hysteresis by less than 1 diopter after storage at 85°C for 120 hours, maintaining optical quality and stability, and is cost-effective while being compatible with conductive liquids.
Implementation Method 1
The housing incorporates electrodes by which a shape of an interface between the two immiscible liquids may be manipulated based on the principles of electrowetting
Data Source
AI summary
A liquid lens including a first liquid comprising a polyfluoroaromatic compound represented by formula (I): Fx—(aromatic)—Y—R1. “x” is within a range of from 2 to 5. Y is one of CH2, Si(Alk)2, Ge(Alk)2, O, and S. “Alk” is a linear aliphatic chain. R1 is any organic group, but can be one of a linear aliphatic chain, a cycloaliphatic, a fluorocycloaliphatic, and an aromatic residue. “Aromatic” is any six carbon aromatic ring. Examples of the chemical compound represented by formula (I) include butylpentafluorobenzene; dimethylnonafluorohexylpentafluorophenylsilane; trimethylpentafluorophenylgennane; butoxypentafluorobenzene; cyclopentoxypentafluorobenzene; 1-n-octyloxypentafluorobenzene; cyclooctyloxypentafluorobenzene; 1-n-dodecyloxypentafluorobenzene; cyclopentylpentafluorophenylsulfide; phenoxypentafluorobenzene; 2,4-difluoroanisole; and heptafluoropentyloxypentafluorobenzene. The first liquid has a density in a range of from 0.95 g/mL to 1.35 g/mL (at 20° C.). The liquid lens further includes a second liquid that forms an interface with the first liquid. The second liquid can be substantially free of water.