Electrophoretic Display Edge Pixel Electrode Segmentation
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Solution Overview
Problem
Conventional electrophoretic displays have a brighter edge area compared to the display area when showing white gray levels due to continuous edge pixel electrodes without division, leading to visibility issues.
Innovation Solution
The electrophoretic display incorporates edge pixel electrodes with the same shape, material, and reflectance as display pixel electrodes, along with an edge drive unit and signal line to apply driving signals, ensuring the edge area has the same brightness as the display area, using a common electrode and electronic ink layer between panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If edge pixel electrodes are continuously formed without division, then device complexity is reduced, but the edge area displays brighter than the display area when white gray level is displayed
Solution Approach 1:
The edge pixel electrodes are divided into multiple segments along the edge direction, with each segment controlled by separate drive signals. This segmentation allows independent control of edge pixel brightness, enabling the edge area to display at the same brightness level as the display area without requiring continuous electrode formation, thus resolving the contradiction between structural simplicity and brightness control.
2Illumination intensity
If edge pixel electrodes are divided into segments with separate drive signals, then edge area brightness control is improved, but device complexity increases
Solution Approach 1:
Different drive signals are applied to different segments of edge pixel electrodes based on their local positions and requirements. The first drive signal is applied to first segments and the second drive signal to second segments, allowing localized brightness control. This approach achieves uniform brightness control while maintaining manageable structural complexity through systematic segmentation.
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 ensures equal reflectance between the display and edge areas, eliminating brightness distinctions and enhancing visibility by making the edge area indistinguishable from the display area during image display.
Implementation Method 1
The electronic ink contains both a plurality of black or white positive charged particles, and a plurality of black or white negative charged particles, in a microcapsule. The electrophoretic display displays images by moving the white and black charged particles from the electronic ink to electrodes having opposite polarities, respectively
Implementation Method 2
The electrophoretic display displays images by moving the white and black charged particles from the electronic ink to electrodes having opposite polarities, respectively, and reflecting external light
Data Source
AI summary
An electrophoretic display includes a display area where images are displayed, and an edge area around the display area and where a single color is displayed. The display area includes a plurality of display pixels which include gate lines on a first substrate, data lines intersecting the gate lines, thin film transistors connected to the gate lines and data lines, display pixel electrodes on the first substrate and connected to the thin film transistors, a common electrode on a second substrate and facing the first substrate, and an electronic ink layer between the display pixel electrodes and the common electrode The edge area includes a plurality of edge pixels which include edge pixel electrodes in a same shape as the display pixel electrodes.