Array Substrate Capacitance Lines Grid Stabilize Display Potential
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Solution Overview
Problem
In liquid crystal display devices, the increased size leads to instability in potential distribution due to standard deviation in resistance of storage capacitance lines, resulting in display defects like shadowing.
Innovation Solution
The array substrate includes electrodes, capacitance forming portions, and capacitance lines arranged in a specific pattern to stabilize potential distribution, with the capacitance lines extending in perpendicular directions and overlapping the electrodes via insulators, reducing standard deviation in resistance and maintaining stable potentials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the size of the liquid crystal display device is increased, then the display area is enlarged, but the standard deviation in resistance distribution of Cs lines increases causing potential instability
Solution Approach 1:
The capacitance line is divided into multiple segments arranged in a grid pattern, with capacitance forming portions at intersections. This segmentation reduces the effective resistance path length and distributes the capacitance throughout the display area, thereby reducing standard deviation in resistance distribution while maintaining large display area.
Solution Approach 2:
The capacitance lines are arranged in both first and second directions (orthogonal grid), transitioning from single-direction linear extension to two-dimensional grid structure. This dimensional change provides multiple parallel capacitance paths, reducing resistance variation across the enlarged display area and stabilizing potentials at pixels.
2Device complexity
If Cs lines are disposed parallel to data lines in borders between pixels, then the structure is simplified, but standard deviation in resistance distribution increases
Solution Approach 1:
Instead of single continuous Cs lines parallel to data lines, the capacitance lines are segmented into multiple sections arranged in a grid with capacitance forming portions at intersections. This segmentation creates multiple distributed capacitance points that uniformly stabilize potentials across the display area without significantly increasing structural complexity.
Solution Approach 2:
The first and second capacitance lines are merged at intersection points to form capacitance forming portions. This merging creates a network effect where multiple capacitance paths converge, providing superior potential stabilization compared to single parallel lines while maintaining manageable structural complexity.
3Reliability
If more capacitance lines are added to reduce resistance standard deviation, then potential stability improves, but device complexity increases
Solution Approach 1:
The capacitance lines serve dual functions: they provide capacitance for potential stabilization and form a grid structure that also acts as signal distribution pathways. This multi-functionality allows the same structure to provide both capacitance and resistance reduction without proportionally increasing device complexity.
Solution Approach 2:
By extending capacitance lines in both first and second directions to form a grid, the structure achieves superior potential stabilization through two-dimensional distribution. This dimensional approach provides multiple parallel capacitance paths without requiring excessive line density in any single direction, balancing effectiveness with structural simplicity.
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 effectively stabilizes potentials at electrodes, improving display quality by reducing defects and maintaining a high aperture ratio, thus enhancing the brightness and reducing power consumption.
Implementation Method 1
The capacitance forming portions are arranged in the first direction and the second direction to overlap the electrodes via an insulator
Data Source
AI summary
An array substrate includes electrodes, capacitance forming portions, a first capacitance line, and a second capacitance line. The electrodes are arranged in a first direction and a second direction crossing the first direction. The capacitance forming portions are arranged in the first direction and the second direction to overlap the electrodes via an insulator. The first capacitance line includes a section of a conductive film including sections configured as the capacitance forming portions and extends in the first direction. The first capacitance line is coupled to the capacitance forming portions adjacent to each other in the first direction, respectively. The second capacitance line includes a section of the conductive film including sections configured as the capacitance forming portions and extends in the second direction. The second capacitance line is coupled to the capacitance forming portions adjacent to each other in the second direction, respectively.