Liquid Crystal Display Common Electrode Routing for Crosstalk Reduction
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Solution Overview
Problem
Liquid crystal displays with embedded microcavity structures face issues of common electrode delay and crosstalk due to the overlap with data lines, which affects signal transmission and display quality.
Innovation Solution
The solution involves forming a common electrode line parallel to the gate line, connected through a contact hole in the passivation layer, allowing for independent signal application to each pixel unit and eliminating the need for a separate shielding electrode, thereby preventing crosstalk and improving common voltage signal delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a shield electrode is formed to overlap with the data line to prevent common electrode delay, then the common electrode delay is reduced, but crosstalk between the common electrode and data line occurs
Solution Approach 1:
The common electrode structure is segmented into a common electrode line layer and a separate common electrode layer, allowing independent routing and connection through contact holes. This segmentation enables the common electrode line to be routed parallel to gate lines rather than overlapping with data lines, eliminating crosstalk while maintaining timely signal delivery through direct contact hole connections.
Solution Approach 2:
The solution transitions from a planar overlapping structure to a three-dimensional structure using contact holes that penetrate through the passivation layer. The common electrode line is positioned in one layer while the common electrode is positioned in another layer, connected vertically through contact holes, thereby separating the common electrode path from the data line path and eliminating crosstalk.
2Object-generated harmful factors
If the common electrode is connected to the common electrode line through a contact hole, then crosstalk is prevented, but the structure complexity increases
Solution Approach 1:
The common electrode line is merged with the gate line layer, forming them simultaneously in the same manufacturing process. This merging reduces structure complexity by eliminating separate processing steps for the common electrode line, while the contact hole connection to the common electrode maintains crosstalk prevention.
3Object-generated harmful factors
If the common electrode line is formed parallel to the gate line, then crosstalk with data lines is eliminated, but the manufacturing precision requirements increase
Solution Approach 1:
The common electrode line and gate line are formed in the same layer and simultaneously during the same manufacturing process, ensuring precise alignment and parallel positioning. This merging approach reduces manufacturing precision requirements compared to forming separate lines that would require additional alignment steps.
Data Source
AI summary
Provided is a liquid crystal display. The liquid crystal display includes: a substrate; a gate line, a common electrode line and a data line formed on the substrate; an insulating layer formed on the gate line, the common electrode line and the data line; a pixel electrode formed on the insulating layer; a microcavity formed on the pixel electrode and including a liquid crystal injection hole; a common electrode formed on the microcavity; a support member formed on the common electrode; and a capping layer formed on the support member and covering the liquid crystal injection hole, in which the common electrode line and the common electrode are connected to each other through a contact hole formed in a passivation layer.