Array Substrate Layout for LCD Mura-Free Polarity Inversion
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Solution Overview
Problem
In liquid crystal display (LCD) devices with a dual gate structure, the uniformity of voltage polarity across sub-pixels leads to undesirable light and dark stripes (mura) due to the same polarity of data signals from adjacent sub-pixels, and methods like dot inversion increase power consumption and reduce display effectiveness.
Innovation Solution
An array substrate design with alternating first and second extensions in data lines, combined with compensation blocks and specific connections between gate and data lines, reverses the polarity of sub-pixels to prevent vertical stripes and maintain uniform charging, thereby improving display quality without increasing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If dot inversion is used to eliminate mura, then the mura phenomenon is eliminated, but power consumption increases sharply
Solution Approach 1:
The patent applies different polarity arrangements to different regions of the display. Specifically, even-numbered data lines use dot inversion while odd-numbered data lines use line inversion, creating local variations in polarity patterns that eliminate mura without requiring global dot inversion across the entire display, thereby reducing overall power consumption.
Solution Approach 2:
The display data lines are segmented into two groups: even-numbered data lines and odd-numbered data lines. Each group applies a different polarity inversion strategy (dot inversion for even lines, line inversion for odd lines), allowing the system to address mura in a segmented manner rather than applying a uniform approach across all lines, thus optimizing power consumption.
2Object-affected harmful factors
If dot inversion is used to eliminate mura, then the mura phenomenon is eliminated, but charging uniformity deteriorates
Solution Approach 1:
Different polarity inversion strategies are applied to even and odd data lines respectively. Even-numbered data lines use dot inversion while odd-numbered data lines use line inversion, creating localized polarity patterns that eliminate mura while maintaining more uniform charging across sub-pixels compared to global dot inversion.
Solution Approach 2:
Instead of applying the same inversion method (dot inversion) to all data lines, the patent inverts the approach by applying different methods to even and odd lines. This alternative strategy reverses the conventional uniform approach and achieves both mura elimination and improved charging uniformity.
3Area of stationary object
If dual gate structure is used to narrow frame, then screen-to-body ratio increases, but mura phenomenon occurs
Solution Approach 1:
The patent changes the polarity parameters of data signals in a systematic pattern based on line number (even vs. odd). By varying the polarity inversion strategy according to the data line number, the system maintains the dual gate structure's space-saving benefits while eliminating the mura phenomenon through controlled polarity variations.
Solution Approach 2:
The patent implements periodic polarity inversion patterns where even-numbered data lines follow one inversion pattern and odd-numbered data lines follow another. This periodic alternation of polarity patterns across adjacent data lines eliminates the consistent polarity differences that cause mura, while preserving the dual gate structure's high screen-to-body ratio.
Data Source
AI summary
An array substrate and display device are provided. The array substrate includes a base substrate, and gate lines, data lines, compensation blocks and sub-pixels located on the base substrate. Two gate lines are arranged between two adjacent rows of sub-pixels. The data lines are provided with multiple first extensions and second extensions arranged alternately. The extending direction of the first extensions intersects with the extending direction of the second extensions.