Pattern Electrode Structure for Electrowetting Self-Cleaning
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Solution Overview
Problem
Existing electrowetting self-cleaning apparatuses face limitations in efficiently removing small water droplets due to low inclination angles and small droplet sizes, leading to reduced efficiency and adhesion issues, especially in applications like side cameras where the inclination angle is small.
Innovation Solution
A pattern electrode structure is designed with alternating polarities and branch electrodes to generate a drawing motion using attractive electromagnetic forces, allowing the droplet to fall even at low inclination angles by combining oscillation and drawing principles, and including additional electrodes to enhance the falling motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a basic electrode structure is used in electrowetting self-cleaning apparatus, then the structure is simple and easy to manufacture, but the efficiency of removing small water droplets is low due to adhesion issues at small inclination angles
Solution Approach 1:
The electrode is divided into multiple independent electrode patterns arranged in an alternating sequence. Each electrode pattern functions as an independent unit that can be controlled separately, allowing the creation of complex electric field distributions without requiring a completely new electrode design. This segmentation enables improved droplet removal efficiency while maintaining manufacturing feasibility through standardized repeating units.
Solution Approach 2:
Different regions of the electrode structure are designed with different properties - specifically, electrode patterns with alternating polarities are created to generate localized attractive forces. The electrode patterns are strategically positioned and sized to create varying electric field strengths in different areas, optimizing the drawing motion effect in regions where droplet removal is most needed while maintaining overall structural simplicity.
2Force
If alternating current voltage is applied to generate vibration of fluid droplets, then the fixing force of droplets is reduced and droplets begin to slide, but the droplets may not fall efficiently at small inclination angles due to insufficient attractive force
Solution Approach 1:
The invention combines two different voltage application modes - alternating current for generating vibration and direct current for generating strong attractive forces - into a single coordinated operation. The controller applies alternating current voltage to generate vibration that reduces fixing force, while simultaneously applying direct current voltage to specific electrode patterns to create strong drawing motion. This merging of approaches enables efficient droplet removal at small inclination angles by overcoming the limitation of using either method alone.
Solution Approach 2:
The controller operates by periodically switching between different voltage application modes. Alternating current voltage is applied in periodic cycles to generate vibration, while direct current voltage is applied in coordinated periodic intervals to enhance the drawing motion. This periodic action allows the system to dynamically adjust the balance between vibration-induced loosening and electric field-induced drawing, optimizing droplet removal efficiency throughout the operation cycle.
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 pattern electrode structure significantly increases the movability of fluid droplets, overcoming adhesion issues and improving the efficiency of self-cleaning, especially in applications with small inclination angles, such as side cameras, by applying voltage through strategically arranged electrodes.
Implementation Method 1
An electrowetting phenomenon refers to a phenomenon in which a contact angle between a solid and an electrolyte is changed by a potential difference between the solid and the electrolyte.
Implementation Method 2
the fluid droplet having the polarity may receive an attractive force and a repulsive force because of an electric field formed on the surface of the board
Implementation Method 3
the fluid droplet having the polarity may vibrate (oscillate) because of a periodic change in electric field when alternating current voltage is applied
Implementation Method 4
a flow of electric current is restricted by the insulator applied onto the electrode. Therefore, the electrowetting phenomenon is receiving great attention
Data Source
AI summary
A pattern electrode structure for an electrowetting apparatus, which is laminated between a base material and a dielectric layer of the electrowetting apparatus, includes a first electrode portion including a first electrode connection portion, a first basal pattern electrode connected to the first electrode connection portion, and a plurality of first upper branch electrodes connected to the first basal pattern electrode, and a second electrode portion including a second electrode connection portion, a second basal pattern electrode connected to the second electrode connection portion, and a plurality of second upper branch electrodes connected to the second basal pattern electrode, the second electrode portion having a different polarity from the first electrode portion, in which the second basal pattern electrode extends and traverses in a width direction of a plane of the pattern electrode structure.