Electrophoretic Substrate With Inner Common Electrode
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Solution Overview
Problem
Current electrophoretic display (EPD) technologies face challenges in improving display performance, particularly in maintaining high contrast and reducing electric field leakage between pixel electrodes, which affects image quality and power consumption.
Innovation Solution
A substrate configuration featuring an insulating base material with a pixel electrode and a common electrode where all sides of the common electrode are located inside the pixel electrode in a plan view, along with a coupling portion that couples adjacent common electrodes, helps to maintain the electric field within the pixels, reducing leakage and enhancing display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the common electrode is positioned to overlap with the pixel electrode in conventional EPD structures, then the storage capacitor function is achieved, but electric field leakage occurs between adjacent pixels reducing display performance
Solution Approach 1:
The common electrode is divided into multiple separate common electrodes, each corresponding to and positioned inside a respective pixel electrode. This segmentation prevents electric field leakage between adjacent pixels by isolating the electric field confinement to individual pixel regions, thereby improving display performance while eliminating the harmful cross-pixel electric field interference.
2Ease of manufacture
If the common electrode extends beyond the pixel electrode boundaries, then manufacturing is simplified, but electric field leakage increases and contrast ratio deteriorates
Solution Approach 1:
The common electrode is designed with a localized configuration where each common electrode is positioned inside its corresponding pixel electrode boundaries. This local quality approach ensures that the electric field is confined to the intended pixel region, maintaining high contrast ratio by preventing field leakage, while the overall structure remains manufacturable through standard fabrication processes.
3Object-generated harmful factors
If the common electrode is positioned inside the pixel electrode, then electric field leakage is reduced, but the storage capacitor area is decreased
Solution Approach 1:
By dividing the common electrode into multiple segmented electrodes, each positioned inside its corresponding pixel electrode, the patent achieves effective electric field confinement to reduce leakage. The segmented structure maintains adequate storage capacitor area within each pixel region, balancing the trade-off between field leakage reduction and capacitor area preservation.
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 configuration improves display performance by maintaining high contrast and reducing unevenness, thereby enhancing the overall image quality and reducing power consumption in EPD devices.
Implementation Method 1
an electrophoretic layer disposed so as to face the substrate... Black fine particles 161 and white fine particles 162 are electrophoretic particles
Data Source
AI summary
According to an aspect, a substrate includes an insulating base material, a pixel electrode provided on one surface side of the base material, a common electrode provided between the base material and the pixel electrode. All sides on an outer periphery of the common electrode are located inside the pixel electrode in a plan view.