Electrophoretic Display Electrodes Using Conductive Meshes
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Solution Overview
Problem
Conventional electrophoretic displays are limited in their ability to produce full-color and large-format displays due to their reliance on transparent conductors, which lack the necessary conductivity for fast switching and result in non-uniformity and limited transparency.
Innovation Solution
The use of conductive line, mesh, or lattice electrodes made of metals or conductive nanomaterials like silver nanowires and carbon nanotubes, which improve electrical and optical performance by enabling independent control of colorants and enhancing transparency through optimized geometries and arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transparent conductors are used for electrodes, then transparency is maintained, but conductivity is insufficient for fast switching and uniformity is compromised
Solution Approach 1:
The patent employs a composite electrode structure combining transparent conductive oxide (TCO) layers with metal reflective layers. The TCO provides transparency while the metal layer enhances conductivity, creating a composite system that achieves both optical and electrical performance requirements simultaneously.
Solution Approach 2:
The patent applies different material properties to different regions of the electrode structure. The TCO layer provides transparency in regions where light transmission is critical, while metal layers are positioned to provide high conductivity in regions requiring fast electrical response, optimizing each region for its specific function.
2Ease of manufacture
If conventional electrophoretic display structures are used, then manufacturing is simpler, but full-color and large-format capabilities are limited
Solution Approach 1:
The patent divides the display into multiple independently controllable segments or pixels, each capable of displaying different colors. This segmentation allows the display to achieve full-color capability by combining multiple monochrome segments while maintaining a relatively simple manufacturing process for each individual segment.
Solution Approach 2:
The patent creates a display structure that can serve multiple functions: it can display different colors, support large formats, and maintain manufacturability. The universal electrode design and modular colorant particle systems enable the same basic structure to support various display configurations and color combinations.
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 allows for high-transparency, flexible, and reliable electro-optical displays capable of achieving full-color and large-format applications by improving conductivity and reducing optical losses, enabling efficient control of colorant particles for various optical states.
Implementation Method 1
Electrophoresis is the translation of charged objects in a fluid in response to an electric field. Electrophoretic inks are useful as a medium to enable bistable, low power types of displays.
Implementation Method 2
The use of conductive line, mesh, or lattice electrodes made of metals or conductive nanomaterials like silver nanowires and carbon nanotubes, which improve electrical and optical performance by enabling independent control of colorants
Data Source
AI summary
A display element includes a first electrode including conductive lines, a second electrode, and a dielectric layer on the first electrode. The dielectric layer has recess regions therein exposing at least portions of the conductive lines. The display element includes a fluid with colorant particles between the first electrode and the second electrode.