Electrophoretic Display Membrane Layer Hole Patterns
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Solution Overview
Problem
The existing electrophoretic display devices have manufacturing complexities and inefficiencies, leading to prolonged production times and increased costs, with challenges in internalizing the electrophoretic layer on the lower substrate and preventing incomplete filling of the electrophoretic dispersion liquid.
Innovation Solution
The solution involves a lower substrate with pixel electrodes and partition walls to define pixel areas, filled with electrophoretic dispersion liquid and covered by a membrane layer with hole patterns, which enhances filling efficiency and stability, and an upper substrate bonded with the lower substrate to form a sealed and stable electrophoretic display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electrophoretic film is manufactured separately and then laminated onto the lower substrate, then the display device can be assembled, but the manufacturing process becomes complicated and production time increases
Solution Approach 1:
The electrophoretic film manufacturing process is merged with the lower substrate manufacturing process. The electrophoretic dispersion liquid is filled into pixel areas formed on the lower substrate, and the electrophoretic film is formed directly on the lower substrate, eliminating the need for separate film manufacturing and lamination steps.
Solution Approach 2:
The pixel areas are formed in advance on the lower substrate before filling with electrophoretic dispersion liquid. This preliminary formation of the substrate structure with defined pixel areas enables direct filling and film formation, streamlining the overall manufacturing process.
2Ease of manufacture
If the electrophoretic film is manufactured separately, then assembly is possible, but production cost increases
Solution Approach 1:
Multiple manufacturing operations are merged into a single integrated process. The lower substrate manufacturing, electrophoretic dispersion liquid filling, and electrophoretic film formation are combined into one continuous process, reducing the number of separate manufacturing steps and associated costs.
3Reliability
If electrophoretic dispersion liquid is filled into pixel areas, then the display device can function, but incomplete filling may occur
Solution Approach 1:
A membrane layer with hole patterns serves as an intermediary structure during the filling process. The hole patterns control the filling flow, ensuring complete and uniform distribution of electrophoretic dispersion liquid into pixel areas while preventing overflow and incomplete filling.
Solution Approach 2:
The membrane layer is designed with porous hole patterns that allow controlled passage of electrophoretic dispersion liquid. The porous structure enables uniform filling across all pixel areas while maintaining control over the filling process.
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 approach improves display quality, manufacturing efficiency, and driving stability, preventing incomplete filling and vapor generation, while allowing for high-quality color image presentation.
Implementation Method 1
an electrophoretic display device refers to a device capable of displaying images using electrophoresis wherein colored charge particles are moved by an electric field applied from the outside
Data Source
AI summary
An electrophoretic display device includes a lower substrate having pixel electrodes thereon to define a plurality of pixel areas; partition walls formed on the lower substrate to surround the pixel electrodes; electrophoretic dispersion liquid having a plurality of charged particles colored to display colors, the electrophoretic dispersion liquid filled into the plurality of the pixel areas defined by pixel electrodes and surrounding the partition walls; a membrane layer disposed on the partition walls and covering the electrophoretic dispersion liquid, the membrane layer comprising a plurality of hole patterns at portions corresponding to the plurality of the pixel areas; and an upper substrate bonded with the lower substrate such that the membrane layer is disposed therebetween.