Microcells for electrophoretic displays and methods of preparing the same
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Solution Overview
Problem
Existing electrophoretic displays face challenges in producing a broader color gamut and suffer from coating defects, particularly in shallower microcells, which are more prone to sealing issues and require more complex manufacturing processes.
Innovation Solution
The design of microcells with edge-to-edge distances ranging from 50 to 125 microns and depths between 3 to 15 microns, filled with electrophoretic fluids containing four differently colored pigment particles, reduces coating defects and enables fast color switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If microcell depth is reduced to enable thinner electrophoretic layers, then smaller electric fields are required and manufacturing is simplified, but coating defects increase and robustness decreases
Solution Approach 1:
The patent optimizes the edge-to-edge distance parameter within a specific range (50-125 microns) to balance multiple competing requirements. This parameter adjustment enables shallower microcells while maintaining adequate coating quality and reducing severe drop-in defects, resolving the contradiction between reduced depth and manufacturing precision.
2Ease of manufacture
If microcell edge-to-edge distance is increased, then coating process window is widened and manufacturing is easier, but severe drop-in defects increase
Solution Approach 1:
The patent identifies and optimizes the edge-to-edge distance parameter within a specific range (50-125 microns) that simultaneously provides an adequate coating process window and minimizes severe drop-in defects. This parameter optimization resolves the contradiction between ease of manufacture and reliability.
3Strength
If thicker microcells are used, then durability increases and color saturation improves, but larger electric fields are required increasing electronics cost
Solution Approach 1:
The patent optimizes microcell dimensions including depth and edge-to-edge distance to achieve adequate durability and color saturation while minimizing the electric field requirements. The optimized geometry allows for thinner microcells that require smaller electric fields, reducing electronics cost while maintaining sufficient mechanical robustness.
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 design achieves durable and efficient color production with reduced coating defects, allowing for fast color switching speeds and improved manufacturing efficiency in electrophoretic displays.
Implementation Method 1
The electrophoretic display (EPD) is a non-emissive device based on the electrophoresis phenomenon of charged pigment particles suspended in a solvent
Implementation Method 2
a top-sealing layer that encloses the electrophoretic fluid within the microcells
Data Source
AI summary
Electrophoretic displays comprising an electrophoretic media layer including a film of microcells and methods of preparing the same are disclosed. Desirable electric optical performances and coating quality can be achieved by the electrophoretic displays disclosed herein.