Electrowetting Cell Compensation for Gravity-Induced Meniscus Distortion

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Solution Overview

Problem

Existing electrowetting cell designs are limited by external forces such as gravity, which cause distortion in the meniscus shape and restrict their application in larger format light processing due to directional and orientation-dependent effects.

Innovation Solution

Incorporating external-force compensation electrodes within the electrowetting cell, these electrodes apply a compensation voltage based on sensed conditions and orientation to counteract distortions, maintaining the intended optical state of the fluids.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If the size of the electrowetting cell is increased for larger format light processing applications, then the light processing capability is improved, but the distortion of the meniscus due to external forces such as gravity increases

Engineering Contradiction:

Improvecell sizeVSAvoidmeniscus shape

Core Design Contradiction:

Area of stationary objectVSShape

Solution Approach 1:

The patent introduces compensation electrodes that generate an electrical force to counterbalance the gravitational force acting on the conductive fluid. By applying a compensation voltage to these electrodes, an upward electrical force is created that opposes the downward gravitational force, thereby preventing gravity-induced distortion of the meniscus shape in larger cells

Inventive Principle:

Principle #8Anti-weight (Counterweight)

Solution Approach 2:

The patent dynamically adjusts the compensation voltage parameter based on the cell orientation and size. By changing the voltage parameter applied to the compensation electrodes, the system adapts to different gravitational effects in larger cells, maintaining optimal meniscus shape across various operating conditions

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If the electrowetting cell operates in different orientations, then the versatility of the device is improved, but the meniscus distortion varies with orientation

Engineering Contradiction:

Improveorientation independenceVSAvoidmeniscus shape

Core Design Contradiction:

Adaptability or versatilityVSShape

Solution Approach 1:

The patent implements compensation electrodes that can counteract gravitational effects in any cell orientation. The system universally handles different orientations (vertical, horizontal, tilted) by adjusting the compensation voltage, making the electrowetting cell orientation-independent and versatile for various applications

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system uses orientation sensors to detect the cell's current orientation and provides feedback to the control circuit. Based on this feedback, the control circuit adjusts the compensation voltage applied to the compensation electrodes, creating a closed-loop system that maintains consistent meniscus shape across all orientations

Inventive Principle:

Principle #23Feedback

3Area of stationary object

If multiple small electrowetting cells are combined into a larger array, then the light processing area is increased, but the manufacturing complexity and circuitry complexity increase

Engineering Contradiction:

Improvelight processing areaVSAvoidmanufacturing complexity

Core Design Contradiction:

Area of stationary objectVSDevice complexity

Solution Approach 1:

The patent merges multiple small electrowetting cells into a single larger cell structure, eliminating the need for complex arrays. By using a unified cell design with integrated compensation electrodes, the system achieves large light processing area while reducing manufacturing complexity and simplifying the driving circuitry compared to combining multiple independent small cells

Inventive Principle:

Principle #5Merging (Combining)

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

This solution effectively compensates for external forces, allowing electrowetting cells to maintain their optical performance across various orientations and sizes, enhancing their applicability in larger format light processing applications.

Implementation Method 1

Electrowetting is a microfluidic phenomenon that modifies the shape of a liquid in relation to a surface by applying an electrical field, e.g. by applying a voltage across two electrodes.

Methodology Applied

Scientific EffectElectrowetting: Electrowetting

Implementation Method 2

at least one external-force compensation electrode is located at the second transparent wall... apply a compensation voltage to the at least one external-force compensation electrode

Methodology Applied

Scientific EffectElectrical field: Electric Field

Data Source

PatentUS10620429B2Electrowetting with compensation for force that may otherwise cause distortion or aberration

Publication Date: 2020.04.14 ABL IP HLDG LLC

AI summary

In an electrowetting cell or system using the cell, electrode configuration and/or associated control of electrode drive signal(s) compensate for the impact of an external condition such as gravity, vibration or motion, which may otherwise cause distortion or aberration in the optical geometry of the fluid(s) of the electrowetting cell. The compensation technology may allow for larger electrowetting cell designs, whether lenses, prisms or other various electrowetting devices.