LCD Array Substrate Layout for Vertical Bright-Dark Line Elimination
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Solution Overview
Problem
Conventional liquid crystal display (LCD) panels with data line share configuration suffer from vertical bright-dark lines due to signal distortion, leading to reduced display quality and uneven brightness.
Innovation Solution
The array substrate is designed with a specific layout of sub-pixels, data lines, and scanning lines, where column groups and row groups are defined to alternately distribute sub-pixels connected to closer or farther data lines and scanning lines, ensuring even charging during dot inversion driving, thereby alleviating the issue of vertical bright-dark lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If data line share configuration is used to reduce the number of data lines, then the number of data lines is reduced in half, but vertical bright-dark lines appear due to signal distortion causing uneven brightness
Solution Approach 1:
The array substrate is divided into multiple column groups, where each column group contains multiple sub-pixel columns. This segmentation allows different column groups to be driven by different data lines with alternating polarities, thereby distributing the signal distortion effects and eliminating the vertical bright-dark line defects while maintaining the reduced data line configuration.
Solution Approach 2:
Different column groups are assigned different driving schemes with alternating polarities. Specifically, odd-numbered column groups use one polarity sequence while even-numbered column groups use the opposite polarity sequence. This local differentiation in driving quality compensates for the signal distortion in specific regions, ensuring uniform brightness across the entire display panel.
2Speed
If the number of scanning lines is doubled in data line share configuration, then scan time per scanning line is reduced, but charging time of sub-pixels is also reduced leading to insufficient charging
Solution Approach 1:
The patent implements periodic action by alternating the polarity of data lines in different column groups during the charging process. This periodic polarity reversal allows the liquid crystal molecules to be driven effectively with shorter charging times, as the alternating electric field enhances the switching speed and ensures complete charging within the reduced time available due to the doubled scanning line count.
3Productivity
If dot inversion driving is used with data lines having certain impedance, then data signal transmission occurs, but delay distortion occurs causing difference in pixel charging rate between adjacent columns
Solution Approach 1:
The patent introduces asymmetry in the driving scheme by treating odd-numbered and even-numbered column groups differently. Odd column groups use one polarity sequence while even column groups use the opposite sequence. This asymmetric approach compensates for the symmetric delay distortion that occurs in adjacent columns, ensuring that all pixels achieve uniform charging rates despite the impedance-induced delays in the data lines.
Data Source
AI summary
The present invention discloses an array substrate, which includes a sub-pixel array, a number of data lines, and a number of scanning lines. The sub-pixel array is divided into a number of column groups along the distribution direction of the data lines, and is divided into a number of row groups along the distribution direction of the scanning lines. By designing the layout of the sub-pixels, the data lines and the scanning lines in the array substrate, there are alternately distributed sufficiently charged sub-pixels and insufficiently charged sub-pixels exist in a same column of sub-pixels when a dot inversion driving is used. Therefore, a LCD panel including the array substrate has even brightness uniformity, and the defect of vertical bright-dark lines is alleviated. The present invention also discloses a LCD panel including the above array substrate and a corresponding LCD.