Fluid Lens Bubble Suppression via Thixotropic Additives

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Solution Overview

Problem

Fluid lenses face challenges in reducing bubble formation under negative pressure, which limits their optical power adjustments and aesthetics, as existing solutions either restrict design configurations or require high actuation forces.

Innovation Solution

Incorporating a thixotropic additive, such as silica nanoparticles, into the lens fluid to increase cohesive energy and reduce gas solubility, combined with a coating on the interior surface to manage nucleation sites, allowing for adjustable optical power without bubble formation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If negative pressure is applied to adjust optical power, then optical power adjustment range is improved, but bubble formation increases

Engineering Contradiction:

Improveoptical power adjustment rangeVSAvoidbubble formation

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the physical-chemical parameters of the lens fluid by adding thixotropic additives (such as silica nanoparticles) to modify the fluid's properties. This increases cohesive energy and reduces gas solubility, allowing the fluid to withstand negative pressure without bubble formation while maintaining optical power adjustment capability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite lens fluid by combining base fluid with thixotropic additives. This composite material exhibits both the required optical properties and enhanced mechanical stability under negative pressure, resolving the contradiction between optical power adjustment range and bubble formation

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If conventional lens fluid is used, then manufacturing is simpler, but bubble formation limits optical power adjustments

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidoptical power adjustment range

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The patent modifies the compositional parameters of the lens fluid by incorporating thixotropic additives at controlled concentrations. This maintains manufacturing feasibility while fundamentally improving the fluid's resistance to bubble formation under negative pressure, enabling broader optical power adjustments

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If gas solubility is high in lens fluid, then fluid is easier to handle, but bubble formation increases under negative pressure

Engineering Contradiction:

Improvefluid handlingVSAvoidbubble formation

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent changes the gas solubility parameter of the lens fluid by adding thixotropic substances. This reduces gas solubility to prevent bubble formation while maintaining adequate fluidity for handling through careful selection of additive types and concentrations

Inventive Principle:

Principle #35Parameter changes

4Object-affected harmful factors

If more actuation force is applied to prevent bubbles, then bubble formation is reduced, but device complexity increases

Engineering Contradiction:

Improvebubble formationVSAvoidactuation force requirements

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent changes the mechanical properties of the lens fluid by incorporating thixotropic additives that increase cohesive energy. This allows the fluid to maintain stability under lower actuation forces, reducing the complexity of actuation mechanisms while preventing bubble formation

Inventive Principle:

Principle #35Parameter changes

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 a broader range of optical power adjustments with reduced bubble formation, lower actuation forces, and improved mechanical stability, enhancing the performance and aesthetics of fluid lenses.

Implementation Method 1

Incorporating a thixotropic additive, such as silica nanoparticles, into the lens fluid to increase cohesive energy and reduce gas solubility

Methodology Applied

Scientific EffectThixotropy: Thixotropy

Implementation Method 2

additive that increases the cohesive energy of the lens fluid

Methodology Applied

Scientific EffectCohesion: Cohesion

Implementation Method 3

coating on the interior surface to manage nucleation sites

Methodology Applied

Scientific EffectNucleation: Nucleation

Data Source

PatentUS11703616B2Fluid lens with low gas content fluid

Publication Date: 2023.07.18 META PLATFORMS TECHNOLOGIES LLC

AI summary

An example device includes a fluid lens, where the fluid lens includes a membrane, a substrate, and a fluid located within an enclosure formed at least in part by the membrane and the substrate. The membrane may be an elastic membrane. The fluid may include an amount of an additive that is effective to appreciably reduce bubble formation within the fluid, such as when a negative pressure is applied to the fluid. In some examples, the additive may include particles, such as nanoparticles. The additive may include a thixotropic agent that helps to impart an appreciable thixotropic property to the fluid. Various other methods, systems, and computer-readable media are also disclosed.