Liquid Crystal Display Staggered Sub-pixel Capacitance Compensation
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Solution Overview
Problem
LCD devices with delta-shaped sub-pixel arrangements experience vertical line defects due to differences in charging rates among red, green, and blue sub-pixels, leading to display defects.
Innovation Solution
Increasing the capacitance of red sub-pixel storage capacitors on the second horizontal line compared to the first horizontal line, and adjusting the area and thickness of storage electrodes and passivation layers to equalize charging rates, thereby preventing vertical line defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If three data lines are connected to one output node of the data driver to reduce driver complexity, then device complexity is reduced, but vertical line defects occur due to different charging rates of pixel electrodes
Solution Approach 1:
The patent applies local quality by making the storage capacitor of the red sub-pixel on the second horizontal line have a larger capacitance value than other sub-pixels. This localized modification compensates for the charging rate difference caused by sequential data line activation, ensuring uniform display quality without increasing overall device complexity
Solution Approach 2:
The patent changes the capacitance parameter of the storage capacitor specifically for the red sub-pixel on the second horizontal line. By adjusting this electrical parameter, the charging rate is compensated to match other sub-pixels, eliminating vertical line defects while maintaining the simplified data driver structure
2Reliability
If the capacitance of storage capacitors is increased to compensate for charging rate differences, then display quality is improved, but manufacturing precision requirements increase
Solution Approach 1:
Instead of uniformly increasing all storage capacitor capacitances, the patent applies local quality by modifying only the red sub-pixel capacitance on the second horizontal line. This targeted approach achieves the necessary compensation with minimal deviation from standard manufacturing tolerances
Solution Approach 2:
The patent introduces asymmetry by making one specific storage capacitor (red sub-pixel on second horizontal line) have a different capacitance value from all others. This asymmetric design precisely addresses the charging rate imbalance without requiring high-precision control across the entire display
Data Source
AI summary
A liquid crystal display device for preventing a vertical line defect includes sub-pixels arranged repeatedly in order of red, green, and blue along an N-th (where N is a natural number) horizontal line, and sub-pixels formed in a staggered structure with the N-th horizontal line and arranged repeatedly in order of green, blue, and red along an (N+1)-th horizontal line. Gate lines are formed along the horizontal lines. Data lines are formed to cross the gate lines with a gate insulating layer disposed therebetween and formed to be bent along the sub-pixels of the staggered structure. Thin film transistors are connected to the gate lines and to the data lines and pixel electrodes are connected to the thin film transistors. Storage electrodes overlap the pixel electrodes with the gate insulating layer and a passivation layer disposed therebetween to form storage capacitors. The capacitance of a red storage capacitor of the (N+1)-th horizontal line is greater than the capacitance of a red storage capacitor of the N-th horizontal line.