Dual Particle Electrophoretic Display with Porous Cell Walls
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Solution Overview
Problem
Existing electrophoretic display devices have slow response times, which hinder their ability to provide fast gray scale imaging, and current manufacturing methods are costly and inefficient.
Innovation Solution
A TFT-based electrophoretic display with partially contained cells between substrates allows for fluid communication, enabling efficient deposition and distribution of electrophoretic particles, and a method of filling the display with electrophoretic fluid using a partial vacuum to ensure uniform distribution and rapid particle movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrophoretic particles are used in sealed cells, then particle containment is improved, but fluid communication between cells is lost and manufacturing complexity increases
Solution Approach 1:
The display is divided into multiple cells with individual particle containment walls, allowing each cell to be independently controlled while maintaining fluid communication through gaps between the walls. This segmentation enables reliable particle containment without requiring completely sealed cells, thus reducing manufacturing complexity.
Solution Approach 2:
The particle containment walls include gaps that allow electrophoretic fluid to pass through while still containing particles within each cell. This porous structure enables fluid communication between adjacent cells while maintaining particle containment, balancing reliability with manufacturing simplicity.
2Reliability
If cells are completely sealed, then particle containment is improved, but response time is slowed due to restricted fluid communication
Solution Approach 1:
The containment walls incorporate gaps that function as porous channels, allowing electrophoretic fluid to flow freely between cells while particles remain contained within each cell boundaries. This enables rapid fluid communication and fast response time while maintaining particle containment reliability.
3Ease of manufacture
If conventional manufacturing methods are used, then ease of manufacture is improved, but manufacturing precision and uniformity of particle distribution deteriorate
Solution Approach 1:
Electrophoretic particles are deposited on the substrate before cell formation and sealing. This preliminary deposition ensures uniform particle distribution is established during manufacturing, and the subsequent cell formation process preserves this uniformity without requiring complex post-processing steps.
4Ease of manufacture
If particles are deposited after cell formation, then ease of manufacture is improved, but manufacturing precision of particle distribution deteriorates
Solution Approach 1:
The manufacturing process deposits electrophoretic particles on the substrate before forming the cell structure. This preliminary action allows particles to be uniformly distributed across the substrate surface, and the subsequent cell formation maintains this uniform distribution, achieving both ease of manufacture and high manufacturing precision.
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 solution enables high-resolution, fast response time gray scale imaging with reduced manufacturing costs by allowing efficient particle distribution and movement, improving electrical and colloidal stability, and enhancing display resolution.
Implementation Method 1
The electrophoretic effect operates on the principle that when electrophoretic particles are electrically charged to a particular polarity, the charged electrophoretic particles will migrate from a surface being charged to the same polarity as the charged particles toward a surface charged to a polarity opposite to that of the charged particles
Implementation Method 2
a method of filling the display with electrophoretic fluid using a partial vacuum to ensure uniform distribution
Data Source
AI summary
A dual particle electrophoretic display and a method for manufacturing same are disclosed. The display comprises a back substrate and a transparent substrate forming a cavity therebetween. The transparent substrate including one or more cathode electrodes forming a plurality of electronically and selectively addressable pixels; one or more side walls extending from the transparent substrate, the side walls defining corresponding pixel cells, wherein a plurality of electrophoretic particles are contained in each cell and a substantially clear suspension fluid is distributed throughout the cavity by a gap formed between the site walls. A color or shade of the pixels within the display is determined by applying a driving voltage to the pixels of based on a desired level of Gray scale coding.