EWOD Display Panel Ink Aggregation for Color
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Reflective-type EWOD display technology is limited to black-and-white display without a color filter, resulting in poor display effectiveness and complex structures for color display.
Innovation Solution
A display panel design featuring a first and second substrate with sub-pixel regions, including a hydrophilic liquid, ink, hydrophobic dielectric layer, and electrodes, where the ink aggregates under an electric field to control gray scale and achieve full-color display without additional color filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a color filter is added to achieve color display, then color display capability is improved, but device complexity increases
Solution Approach 1:
The patent uses ink that changes its optical properties (spreading and aggregating) to display different colors and grayscale levels, replacing the traditional color filter approach. The ink's ability to change its distribution state under electric field control enables full-color display without adding complex color filter structures.
Solution Approach 2:
The ink serves multiple functions: it provides color display, grayscale control, and replaces the need for separate color filters. By making the ink the primary functional element that performs both coloring and modulation, the patent eliminates the need for additional color filter components, thereby reducing structural complexity while maintaining color display capability.
2Manufacturing precision
If voltage is applied to aggregate ink, then grayscale control is improved, but energy consumption increases
Solution Approach 1:
The ink undergoes a phase transition between spread and aggregated states under electric field control. This phase transition enables precise grayscale control as the ink can be positioned at different levels and distributions. The system maintains grayscale precision by controlling the electric field strength to achieve desired ink aggregation levels without requiring continuous high energy input.
Solution Approach 2:
The patent controls grayscale by changing the voltage parameter applied to the electrodes. By adjusting the voltage level, the system precisely controls the degree of ink aggregation, thereby achieving fine grayscale control. The energy consumption is optimized by applying only the necessary voltage to achieve the desired grayscale state, rather than maintaining constant high energy input.
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 full-color, gray-scale display by adjusting the voltage difference between electrodes, enhancing display effectiveness and simplifying the structure by eliminating the need for a color filter.
Implementation Method 1
EWOD (Electro Wetting on Dielectric) refers to the technology that the voltage applied between liquid and a solid electrode is adjusted to vary the surface tension of the liquid on the surface of the solid electrode so as to change the contact angle between them
Implementation Method 2
a hydrophobic dielectric layer... when no electric field is applied between the first electrode and the second electrode, the ink spreads over a surface of the hydrophobic dielectric layer
Data Source
AI summary
A display panel includes a first substrate and a second substrate which are arranged opposed to each other. The space between the first substrate and the second substrate is separated into a plurality of sub-pixel regions. Within each sub pixel region, a first electrode, a first fluid layer, a second fluid layer, a hydrophobic dielectric layer and a second electrode are arranged in this order. The first fluid layer is made of hydrophilic liquid. The second fluid layer is made of ink. When no electric field is applied between the first electrode and the second electrode, the ink spreads over the surface of the hydrophobic dielectric layer. When an electric field is applied between the first electrode and the second electrode, the ink aggregates to expose the hydrophobic dielectric layer.