Array Substrate Common Voltage Uniformity via Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
LCD panels experience distortion in common voltage distribution due to RC delays, leading to uneven current application and degraded image quality, particularly displaying a greenish tint in the central portion.
Innovation Solution
The implementation of an array substrate with a common voltage applying section, including a power supply line wider than the storage voltage lines, and first connecting lines that ensure a uniform current distribution across the storage voltage lines, reducing the impact of RC delays and voltage distortions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the storage voltage line is electrically connected to the common voltage line and overlapped with the pixel electrode, then the storage capacitor can be formed, but RC delay causes non-uniform current distribution and voltage distortion across the LCD panel
Solution Approach 1:
The common voltage line is divided into multiple segments (first common voltage line and second common voltage line) positioned at different locations. This segmentation allows the common voltage to be applied at multiple points simultaneously, reducing the overall resistance and capacitance delay effects that would occur with a single long continuous line, thereby achieving more uniform voltage distribution across the panel.
Solution Approach 2:
A compensation electrode is introduced as an intermediary element between the common voltage line and the pixel electrode. This compensation electrode receives common voltage and provides it to specific regions to compensate for voltage drops and distortions caused by RC delays in the original common voltage line configuration, thereby uniforming the voltage distribution.
2Reliability
If the common voltage line is formed to apply common voltage to the LCD panel, then the storage capacitor can be charged, but voltage distortion occurs at end portions and central portion causing image quality deterioration
Solution Approach 1:
The common voltage line is segmented into multiple sections (first and second common voltage lines) positioned at different locations across the panel. This allows the common voltage to be distributed more evenly, preventing the voltage distortion that occurs at end portions and central portions when using a single continuous line, thereby maintaining image display quality.
Solution Approach 2:
The compensation electrode is used to create equipotential regions by providing common voltage to areas experiencing voltage drops. This ensures that all critical regions (end portions and central portion) maintain approximately the same voltage level, preventing the greenish tint and image quality deterioration caused by voltage non-uniformity.
Data Source
AI summary
An array substrate includes a base substrate, a plurality of storage voltage lines, a plurality of connecting lines, and a common voltage applying section. Pixels are formed in regions defined by a plurality of gate lines extending along a first direction and data lines extending along a second direction. The connecting lines are connected to the storage voltage lines that are formed on adjacent pixels of pixels arranged in the second direction. The common voltage applying section applies a common voltage to the storage voltage lines that are formed in a portion of the pixels arranged in the first direction. Thus, a substantially uniform current may be applied to the display area to decrease the distortion of the common voltage, thereby increasing a liquid crystal display device's display quality.