Array Substrate Data Line Spacing for Uniform Coupling Capacitance
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Solution Overview
Problem
In touch display technologies, existing array substrates face issues with inconsistent potential changes across sub-pixel areas, leading to abnormal color display and Mura phenomena due to unequal coupling capacitances between data lines and pixel electrodes, causing brightness inconsistencies between sub-pixels of different colors.
Innovation Solution
The array substrate design includes a configuration where data lines and touch electrode lines are arranged to ensure equal coupling capacitances between each sub-pixel and its corresponding data lines, with specific distances and positions optimizing the capacitance balance across sub-pixel areas, thereby maintaining consistent potential changes and avoiding brightness inconsistencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If data lines are arranged in conventional configurations, then device complexity is reduced and manufacturing is simplified, but coupling capacitances between data lines and pixel electrodes become unequal, causing brightness inconsistencies and abnormal color display
Solution Approach 1:
The patent applies local quality by making different parts of the data line structure have different properties. Specifically, the data lines are designed with different distances to adjacent sub-pixel areas depending on their location and function. For example, in the first signal line group, the first data line is positioned at a first distance from a first sub-pixel area, while the second data line is positioned at a second distance from a second sub-pixel area. This localized variation in positioning ensures that each data line achieves optimal and uniform coupling capacitance with its corresponding pixel electrode, resolving the brightness inconsistency issue without requiring complete restructuring of the entire display device.
Solution Approach 2:
The patent employs parameter changes by adjusting the physical positioning parameters of data lines relative to sub-pixel areas. The key parameter modified is the distance between data lines and pixel electrodes. By carefully controlling these distances (first distance, second distance, third distance as specified in the claims), the coupling capacitance values are optimized to be equal across different sub-pixel areas. This parameter optimization directly addresses the technical contradiction by achieving uniform electrical characteristics through precise geometric configuration.
2Reliability
If data lines are positioned to achieve equal coupling capacitances, then image quality and brightness uniformity are improved, but the arrangement complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies segmentation by dividing the data line structure into distinct signal line groups. Each signal line group (first signal line group, second signal line group) is independently configured with specific data lines and touch electrode lines positioned at predetermined distances from sub-pixel areas. This segmentation allows each group to be optimized independently for coupling capacitance uniformity, while the overall manufacturing process remains manageable through modular design. The segmentation principle resolves the contradiction by making the complex arrangement systematic and manufacturable through repeated modular units.
Solution Approach 2:
The patent implements equipotentiality by ensuring that all pixel electrodes receive equal coupling capacitance from their corresponding data lines. Through the specific positioning of data lines at calculated distances (first distance, second distance, third distance), the electrical potential conditions are equalized across different sub-pixel areas. This eliminates the Mura effect and brightness inconsistencies, achieving reliable and consistent display performance while maintaining a manufacturable structure through systematic geometric relationships.
3Ease of manufacture
If unequal coupling capacitances exist between data lines and pixel electrodes, then manufacturing is simpler, but potential changes become inconsistent across sub-pixel areas, causing Mura phenomena and abnormal colors
Solution Approach 1:
The patent applies local quality by making different parts of the data line structure have different properties. Specifically, the data lines are designed with different distances to adjacent sub-pixel areas depending on their location and function. For example, in the first signal line group, the first data line is positioned at a first distance from a first sub-pixel area, while the second data line is positioned at a second distance from a second sub-pixel area. This localized variation in positioning ensures that each data line achieves optimal and uniform coupling capacitance with its corresponding pixel electrode, resolving the brightness inconsistency issue without requiring complete restructuring of the entire display device.
Solution Approach 2:
The patent employs parameter changes by adjusting the physical positioning parameters of data lines relative to sub-pixel areas. The key parameter modified is the distance between data lines and pixel electrodes. By carefully controlling these distances (first distance, second distance, third distance as specified in the claims), the coupling capacitance values are optimized to be equal across different sub-pixel areas. This parameter optimization directly addresses the technical contradiction by achieving uniform electrical characteristics through precise geometric configuration.
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
This configuration ensures consistent potential changes across sub-pixel areas, preventing brightness inconsistencies and abnormal color displays, thus enhancing the image quality by maintaining uniformity in sub-pixel brightness across different colors.
Implementation Method 1
unequal coupling capacitances between data lines and pixel electrodes
Implementation Method 2
coupling capacitances between each sub-pixel and its corresponding data lines
Data Source
AI summary
An array substrate includes first data lines, second data lines, third data lines and first touch electrode lines extend in a second direction, all of which are divided into a plurality of line groups. Each line group includes a first signal line group between first two adjacent sub-pixel areas, and a second signal line group between second two adjacent sub-pixel areas. The first two and second two adjacent sub-pixel areas include three sub-pixel areas adjacent in a first direction intersecting the second direction. The first signal line group includes a first data line and a second data line spaced, and the second signal line group includes a third data line and a first touch electrode line spaced. Each of the first, second and third data lines is closer to a respective one of the three sub-pixel areas relative to other three lines in the line group.