Array Substrate Pixel Electrode Layout to Prevent Spacer-Induced Line Breaks
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Solution Overview
Problem
The connection lines of a main pixel electrode near a spacer in current array substrates are prone to breaking due to cracks in the color resist layer, leading to signal disruption and poor display performance.
Innovation Solution
The array substrate design includes a pixel unit with a main pixel electrode and a sub pixel electrode, where the connection lines are positioned far away from the spacer, preventing overlap and ensuring that external forces cannot cause cracks to spread to the connection lines, and multiple connection lines are designed to maintain signal transmission even if some are broken.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the spacer covers and/or is adjacent to the connection line and connection portion of the main pixel electrode, then the spacer can maintain liquid crystal cell gap uniformity, but the connection line is prone to breaking due to crack propagation from the color resist layer
Solution Approach 1:
The invention extracts the harmful interaction between the spacer and connection line by positioning the spacer to be disposed on the pixel unit but ensuring its projection does not overlap with the projection of the connection line on the base substrate. This spatial separation removes the source of stress concentration and crack propagation while maintaining the spacer's function in ensuring liquid crystal cell gap uniformity.
Solution Approach 2:
The invention segments the pixel structure into distinct functional zones: the spacer is positioned in one region while the connection line is routed in another region. This segmentation is achieved by designing the connection line to extend from the branch electrode through a region separated from the spacer's projection, thereby isolating the connection line from mechanical stress caused by the spacer and color resist layer interactions.
2Reliability
If multiple connection lines are designed to extend from the branch electrode, then signal transmission reliability is improved even if some lines break, but the device complexity increases
Solution Approach 1:
The invention applies local quality by providing multiple connection lines specifically in the region where the connection line extends from the branch electrode, while other regions maintain their original simple structure. This localized redundancy ensures signal transmission reliability without unnecessarily complicating the entire device structure.
Data Source
AI summary
An array substrate and a method for fabricating the same are provided. The array substrate includes a base substrate, a pixel unit, and a spacer stacked sequentially. The pixel unit includes a main pixel electrode and a thin film transistor. The main pixel electrode includes a main electrode, a plurality of branch electrodes, and a plurality of connection lines. The main electrode includes a first strip electrode and a second strip electrode crossing each other. The branch electrodes extend diagonally from the main electrode. The connection lines extend from some of the branch electrodes and are electrically connected to the thin film transistor. A projection of the spacer and a projection of the connection lines on the base substrate do not overlap, and the two projections do not overlap in a direction parallel to the first strip electrode and a direction parallel to the second strip electrode.