Full Color Electrophoretic Display via Segmented Substrates
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Solution Overview
Problem
Conventional electrophoretic display apparatuses are limited to mono-color displays and are not capable of providing full color displays, restricting their application beyond e-paper and electric newspapers.
Innovation Solution
An electrophoretic display apparatus is designed with a first substrate containing a thin film transistor, a second substrate with electrophoretic particles and a dispersion medium, and a third substrate with a color filter, where the color filter is aligned with pixel electrodes to enable full color display, along with a method of manufacturing that includes preparing and attaching these substrates with adhesion layers for improved productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional electrophoretic display apparatus uses only pigment particles for display, then the device structure remains simple, but the display is limited to mono-color and cannot provide full color display
Solution Approach 1:
The display device is segmented into multiple functional substrates: a first substrate with electrophoretic particles, a second substrate with color filters, and a third substrate with encapsulation. This segmentation allows each layer to perform its specific function independently, enabling full-color display while maintaining manufacturing simplicity through modular assembly
Solution Approach 2:
The electrophoretic display device is designed with multi-functionality by integrating both electrophoretic particles for grayscale control and color filters for color generation within a single system. This universal design enables the device to achieve both mono-color and full-color display capabilities, expanding its application versatility
2Productivity
If the color filter is formed on a separate third substrate, then the manufacturing process becomes more complex, but the productivity and productive yield are improved
Solution Approach 1:
The color filter pattern is preliminarily formed on a separate third substrate before assembly. This preliminary action allows the color filter to be manufactured independently with optimized processes, improving manufacturing yield and productivity, while the subsequent assembly step simply requires aligning and bonding the pre-prepared substrates
Solution Approach 2:
A third substrate serves as an intermediary carrier for the color filter layer. This intermediary structure allows the color filter to be manufactured separately and then transferred to the final assembly, decoupling the manufacturing complexity from the final device structure and improving overall productivity
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 allows for the realization of a full color electrophoretic display apparatus, enhancing manufacturing productivity and yield while maintaining the advantages of electrophoretic displays such as wide viewing angles and low power consumption.
Implementation Method 1
An electrophoretic display apparatus is a display apparatus that uses electrophoresis. That is, the display apparatus uses electrically charged pigment particles that are dispersed in a suspension and that are moved by an electric field in order to display a desired image.
Data Source
AI summary
An electrophoretic display apparatus includes a first substrate including a thin film transistor, a second substrate attached to the first substrate and including electrophoretic particles and an electrophoretic dispersion medium, and a third substrate attached to the second substrate and including a color filter.