Electrophoretic Pixel Layout With Cross-Line Storage Capacitors
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Solution Overview
Problem
Displays with non-linear pixel arrangements, such as triangular layouts, face challenges in maintaining high aperture ratios while managing increased impedance and RC loading due to signal lines bypassing pixel electrodes, or reduced storage capacitor space when lines cross electrodes directly.
Innovation Solution
The electrophoretic display design includes signal lines that directly cross pixel electrodes, forming storage capacitors with adjacent common electrodes, reducing line length and impedance, and increasing storage capacitance to address limitations in size, resolution, and pixel density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If signal lines bypass multiple pixel electrodes to maintain high aperture ratio in non-linear arrangement, then aperture ratio is improved, but impedance and RC loading are increased due to increased signal line length
Solution Approach 1:
The signal line is segmented into multiple sections, with each section connecting to pixel electrodes in a structured manner. The pixel electrodes are divided into first and second groups that are alternately arranged, allowing signal lines to connect to different groups sequentially rather than bypassing all electrodes, thus reducing overall line length while maintaining aperture ratio.
Solution Approach 2:
The patent employs asymmetric arrangement of pixel electrodes into two distinct groups (first and second groups) with different connection patterns. This asymmetric design allows signal lines to optimize their path by connecting to different electrode groups in a non-uniform manner, reducing the total length and impedance while preserving the non-linear triangular arrangement's aperture advantages.
2Object-affected harmful factors
If multiple signal lines directly cross multiple pixel electrodes without bypassing, then impedance and RC loading are reduced, but layout space of storage capacitor is reduced
Solution Approach 1:
The patent resolves the space conflict by utilizing vertical layering and three-dimensional positioning. Storage capacitors are arranged in different layers and positions relative to the signal lines and pixel electrodes, allowing signal lines to cross electrode groups without encroaching on capacitor layout space. This multi-dimensional arrangement accommodates both low-impedance signal paths and adequate capacitor space.
Solution Approach 2:
The design implements a nested structure where storage capacitors are positioned in regions that do not interfere with signal line crossings. The capacitors are strategically placed in available spaces between and around the signal line paths and pixel electrode groups, effectively nesting the capacitor layout within the overall pixel structure without increasing impedance or reducing aperture ratio.
Data Source
AI summary
An electrophoretic display includes an element array substrate and an electrophoretic display substrate. The element array substrate includes a plurality of signal lines, a plurality of common electrodes, and a plurality of pixel electrodes. A first common electrode and a second common electrode among the plurality of common electrodes are respectively disposed on opposite sides of one signal line of the plurality of signal lines. One pixel electrode among the plurality of pixel electrodes crosses the one signal line and forms a first storage capacitor and a second storage capacitor with the first common electrode and the second common electrode respectively. The electrophoretic display substrate is disposed on the element array substrate.