Array Substrate Common Electrode Routing for Aperture Ratio
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Solution Overview
Problem
In Advanced-Super Dimensional Switching (ADS) type TFT-LCD display devices, the common electrode line occupies a portion of the display region, reducing the aperture ratio and affecting the display effect due to the placement of the common voltage input line, leading to uneven voltage distribution across the common electrodes.
Innovation Solution
The array substrate incorporates first and second connection portions, formed in the same layer as the gate lines, to electrically connect the peripheral common electrode line with common electrodes of adjacent sub-pixels, allowing for even voltage distribution without occupying display area, thereby increasing the aperture ratio and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common electrode line is provided on at least one side of the gate line to supply common voltage to common electrodes, then the common voltage can be input to common electrodes of each sub-pixel, but a portion of the display region is occupied by the common electrode line, reducing the aperture ratio and display effect
Solution Approach 1:
The patent divides the common electrode connection structure into multiple segments: a peripheral common electrode line for overall voltage supply, and multiple first connection portions extending from it to connect to common electrodes of sub-pixels. This segmentation allows the common electrode line to be positioned in the non-display region while maintaining effective voltage distribution across all common electrodes, thus preserving the aperture ratio without compromising reliability.
Solution Approach 2:
The patent transitions from a two-dimensional planar layout where the common electrode line would occupy display area to a three-dimensional arrangement where first connection portions extend in a direction substantially perpendicular to the gate line direction. This dimensional change enables the connection structure to route through non-display regions, eliminating the trade-off between voltage supply reliability and aperture ratio.
2Reliability
If the common electrode line is placed within the display region to ensure proper electrical connection, then electrical connectivity is maintained, but the display area is reduced and display quality deteriorates
Solution Approach 1:
The patent introduces first connection portions as intermediary elements that bridge the peripheral common electrode line and the common electrodes of sub-pixels. These connection portions act as mediators, enabling electrical connectivity to be established through the non-display region rather than requiring the common electrode line to intrude into the display region, thus maintaining both connectivity and display quality.
3Area of stationary object
If connection structures are added to electrically connect peripheral common electrode line with common electrodes without occupying display area, then aperture ratio is increased, but device complexity increases
Solution Approach 1:
The patent merges the first connection portions with the gate line structure by forming them in the same layer and using the same material. This merging reduces device complexity by consolidating multiple functions into a single structural element, while still achieving the goal of connecting the peripheral common electrode line to common electrodes without occupying display area, thus increasing aperture ratio.
4Ease of manufacture
If first and second connection portions are formed in the same layer with the same material as gate lines, then manufacturing process is simplified, but electrical connection reliability must be maintained
Solution Approach 1:
The patent applies universality by making the first connection portions serve multiple functions: they act as electrical connectors between the peripheral common electrode line and common electrodes, and simultaneously function as gate line structures. This multi-functionality is achieved by forming them in the same layer with the same material, simplifying the manufacturing process while maintaining electrical connection reliability through proper design of connection geometry and dimensions.
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
The solution enhances the aperture ratio and display effect by ensuring even voltage application to common electrodes, reducing defects like uneven brightness or flicker in the displayed images, while maintaining the structural integrity and functionality of the ADS type display device.
Implementation Method 1
first connection portions... for electrically connecting the peripheral common electrode line with common electrodes of sub-pixels adjacent to a side of the peripheral common electrode line; second connection portions... for electrically connecting the common electrodes of adjacent sub-pixels
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
An array substrate, a manufacturing method thereof, and a display device are provided. The array substrate comprises a peripheral common electrode line for supplying a common voltage and a plurality of sub-pixels. The array substrate further comprises first connection portions and second connection portions; the first connection portions extend along a first direction and are provided between the peripheral common electrode line and common electrodes of the sub-pixels adjacent to a side of the peripheral common electrode line along a second direction, for electrically connecting the peripheral common electrode line with the common electrodes of the sub-pixels adjacent to the side of the peripheral common electrode line along the second direction; and the second connection portions extend long the first direction and are provided between the common electrodes of adjacent sub-pixels along the first direction, for electrically connecting the common electrodes of the adjacent sub-pixels along the first direction.