Array Substrate Common Electrode Line Arrangement for Aperture Ratio
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Solution Overview
Problem
Conventional TFT-LCD display panels with a dual-gate design have a low aperture ratio due to the parallel arrangement of common electrode lines with scanning and data signal lines, leading to a greenish phenomenon and reduced display efficiency.
Innovation Solution
The array substrate design features common electrode lines extending along the column direction, removing common electrode lines in the row direction, and arranging them between pixel unit groups, with scanning and data signal lines in specific configurations to optimize resistance and aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If common electrode lines are arranged parallel to scanning and data signal lines in a dual-gate design, then the number of IC joints is reduced, but the aperture ratio becomes low
Solution Approach 1:
The patent extracts and removes the common electrode lines from the row direction, keeping only the column-direction common electrode lines. This extraction eliminates the conflict between common electrode lines and signal lines in the row direction, thereby increasing the aperture ratio while maintaining the dual-gate design benefits for reducing IC joints.
Solution Approach 2:
The patent changes the dimensional arrangement by removing common electrode lines from one dimension (row direction) while maintaining them in another dimension (column direction). This dimensional optimization allows signal lines and common electrode lines to coexist without overlap in the row direction, improving aperture ratio.
2Reliability
If common electrode lines are arranged in both row and column directions, then common electrode coverage is improved, but greenish phenomenon increases
Solution Approach 1:
The patent extracts and removes the problematic row-direction common electrode lines that cause greenish phenomenon, while retaining the column-direction common electrode lines that provide adequate coverage. This selective extraction eliminates the harmful effect while preserving the beneficial coverage.
Solution Approach 2:
The patent applies different configurations to different regions: column-direction common electrode lines are maintained throughout to ensure coverage, while row-direction common electrode lines are removed from specific regions where they cause greenish phenomenon. This local differentiation optimizes both coverage and visual quality.
3Area of stationary object
If common electrode lines are removed in row direction, then aperture ratio is enhanced, but common electrode resistance optimization is needed
Solution Approach 1:
The patent compensates for the removed row-direction common electrode lines by optimizing the column-direction common electrode lines. The column-direction lines are extended and optimized to provide sufficient voltage distribution, maintaining low resistance while allowing aperture ratio enhancement through row-direction line removal.
Data Source
AI summary
An array substrate and a manufacturing method thereof, a display panel and a display device are provided. The array substrate includes a base substrate, a plurality of pixel units arranged in a matrix and a plurality of common electrode lines extending along the column direction on the base substrate. There are two scanning signal lines between two adjacent rows of pixel units, and pixel units in a (2N+1)-th column and a (2N+2)-th column are taken as one pixel unit group, N being selected from integers greater than or equal to zero. The respective common electrode lines are located between two adjacent pixel unit groups.