Electrophoretic Display Partitions Eliminate Color Filter
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Solution Overview
Problem
The manufacturing process and production cost of electrophoretic displays (EPDs) are disadvantaged due to the complexity of dispersing bi-stable white and black pigment particles, and they require a separate color filter to display full-color images.
Innovation Solution
An electrophoretic display with a first and second electrode separated by partitions, where each domain contains red, green, and blue charged particles dispersed in an insulating fluid, allowing for the creation of full-color images without the need for a separate color filter, using a thin film transistor array panel and a common electrode panel with partitions to manage the movement of particles under applied voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If white and black pigment particles are dispersed in micro-capsules for electrophoretic display, then the display can achieve bi-stability and high contrast, but the manufacturing process becomes complicated and production cost increases
Solution Approach 1:
The invention divides the display into multiple domains using partitions, with each domain containing only one type of charged particle (red, green, or blue). This segmentation simplifies the manufacturing process by eliminating the need for complex bi-stable white and black particle dispersion, while still achieving stable display states through the controlled movement of single-color particles.
2Ease of manufacture
If a separate color filter is used to display full-color images, then the display can achieve accurate color reproduction, but the device complexity and production cost increase
Solution Approach 1:
The invention merges the color filter function with the electrophoretic particles themselves. By using red, green, and blue charged particles that can be independently controlled and positioned, the display achieves full-color capability without requiring a separate color filter layer, thereby reducing device complexity while maintaining color reproduction accuracy.
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
Enables the display of full-color images without additional processing steps and eliminates the need for a separate color filter, improving contrast ratio and viewing angle by using charged particles that move in opposite directions within the display.
Implementation Method 1
When an electric field is applied to the micro-capsules, the white and black particles move in opposite directions to display images
Implementation Method 2
partition dividing the region between the first electrode and the second electrode into a plurality of domains
Data Source
AI summary
A electrophoretic display is provided, which includes a first electrode formed on a first substrate, a second electrode formed on a second substrate facing the first substrate, a plurality of partitions dividing the domain between the first and second electrodes into a plurality of domains, and a plurality of charged particles colored by one among red, green, and blue, and dispersed in each domain.