Electrophoretic Display Cell With Structured Dielectric Layer
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Solution Overview
Problem
Conventional electrophoretic displays cannot provide a clear state and are limited in extending to full-color displays, lacking the ability to achieve transparent states, dynamic grayscale, and pigment universality due to challenges in identifying stable ink components for the electrokinetic regime.
Innovation Solution
The development of bi-state and tri-state electrophoretic display cells with a three-dimensional architecture that compacts charged colorant particles using a structured dielectric layer and passivated electrodes, allowing for a clear, colored, and white optical states by controlling the position of charged particles within the display cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional electrophoretic displays use white and black charged colorant particles, then black and white states can be achieved, but clear state and full-color display capabilities are lost
Solution Approach 1:
The patent changes the electrical field parameters and ink composition parameters to enable electrokinetic regime operation. By adjusting voltage conditions and using specifically designed ink components (charged white particles in colored fluid), the display achieves clear, colored, and grayscale states beyond conventional black-and-white limitations.
Solution Approach 2:
The patent employs composite ink formulations combining charged white colorant particles with colored carrier fluid. This composite structure enables multiple optical states (clear when particles compacted, colored when dispersed) while maintaining electrokinetic stability through careful selection of particle and fluid properties.
2Reliability
If conventional electrophoretic displays use simple ink formulations, then manufacturing is easier, but stable operation in electrokinetic regime cannot be achieved
Solution Approach 1:
The patent systematically adjusts physical and chemical parameters of the ink formulation (particle charge, fluid viscosity, conductivity) to identify the optimal window for stable electrokinetic operation. This parameter optimization enables reliable display operation while maintaining manageable ink complexity.
3Ease of operation
If conventional electrophoretic displays lack three-dimensional architecture, then device structure is simpler, but particle compaction and optical state control are insufficient
Solution Approach 1:
The patent introduces three-dimensional structural elements (sloped sidewalls, reservoir portions) into the display cell architecture. These geometric features create additional spatial zones that guide and compact particles during electrophoretic movement, enabling precise control over optical states through spatial confinement rather than requiring complex electronic control.
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 enables stable and efficient operation of electrophoretic displays, achieving clear, colored, and white states, as well as grayscale capabilities, by effectively controlling the movement and compaction of charged particles, thereby enhancing display functionality and stability.
Implementation Method 1
Electrophoresis is the translation of charged objects in a fluid in response to an electric field
Data Source
AI summary
In one embodiment, a display element includes a first electrode, a second electrode, and a display cell defined by a dielectric material between the first electrode and the second electrode. The display cell includes a narrower portion adjacent the first electrode and a wider portion. The narrower portion has a first cross-sectional area and the wider portion has a second cross-sectional area. A cross-sectional area of the display cell gradually transitions between the first cross-sectional area and the second cross-sectional area. The display element includes a fluid with colorants within the display cell.