Array Substrate Electrode Layout for Wide-Angle VA LCDs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal display panels with vertical alignment mode suffer from significant color shift at large viewing angles due to large birefringence differences in liquid crystal molecules, and current solutions like 3T-8 domains increase energy consumption by requiring higher backlight brightness.
Innovation Solution
An array substrate design with sub-pixel regions divided into main and sub-regions, where the pixel electrode includes overlapping data lines and trunk electrodes, and branch electrodes connected at specific angles to enhance aperture and transmittance, reducing energy consumption by omitting DC driving voltage and using fewer thin film transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If 3T-8 domains pixel design is employed to improve viewing angles, then viewing angle performance is improved, but aperture decreases and energy consumption increases
Solution Approach 1:
The pixel electrode is segmented into multiple electrode regions (first electrode region, second electrode region, third electrode region, fourth electrode region) with different connection configurations to data lines. This segmentation allows different regions to have different electric field distributions, achieving wide viewing angles without requiring the complex 3T-8 domains structure, thus avoiding the associated energy consumption increase.
Solution Approach 2:
The patent introduces a multi-dimensional electrode arrangement where electrodes are connected to data lines in different orientations (first direction, second direction perpendicular to first). This dimensional arrangement creates multiple liquid crystal alignment regions that work together to improve viewing angles without increasing transistor count or energy consumption.
2Adaptability or versatility
If 3T-8 domains pixel design is employed to improve viewing angles, then viewing angle performance is improved, but aperture decreases
Solution Approach 1:
The pixel electrode is divided into multiple electrode regions (first, second, third, fourth electrode regions) that can be independently configured. This segmentation allows for optimized space utilization within the pixel, achieving 8 liquid crystal alignment regions without the need for additional transistors, thereby maintaining larger aperture compared to 3T-8 domains design.
Solution Approach 2:
Each electrode region serves multiple functions: it defines liquid crystal alignment regions, creates electric fields for viewing angle control, and contributes to overall pixel aperture. This multi-functionality allows the structure to achieve wide viewing angles without sacrificing aperture area.
3Adaptability or versatility
If vertically rotating liquid crystal is adopted for VA mode, then high contrast and wide viewing angles are achieved, but color shift occurs under large viewing angles due to large birefringence difference
Solution Approach 1:
The pixel is divided into multiple liquid crystal alignment regions (first through eighth regions) with different electrode connections. This segmentation creates varied electric field orientations that compensate for the birefringence effects in vertically rotating liquid crystals, reducing color shift while maintaining wide viewing angles and high contrast.
Solution Approach 2:
The electrode regions are asymmetrically arranged with different connection configurations to data lines extending in different directions. This asymmetric design creates non-uniform electric field distributions that counterbalance the optical anisotropy of vertically rotating liquid crystal molecules, thereby minimizing color shift across viewing angles.
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
The design improves viewing angles and reduces energy consumption by increasing pixel aperture and transmittance, maintaining high voltage and brightness while minimizing thin film transistors, thus addressing color shift and energy efficiency issues.
Implementation Method 1
the pixel electrode includes a first trunk electrode corresponding to the main region and a second trunk electrode corresponding to the sub-region
Implementation Method 2
a difference in a birefringence of the liquid crystal molecules is relatively large, resulting in a serious color shift under large viewing angles
Implementation Method 3
The VA mode is a common display mode with advantages of high contrast, wide viewing angles, and no need for rubbing alignment
Implementation Method 4
a liquid crystal layer disposed between the two substrates
Data Source
AI summary
An array substrate and a liquid crystal display panel are provided. The array substrate includes a substrate, a thin film transistor layer disposed on the substrate, and a pixel electrode disposed on the thin film transistor layer. The thin film transistor layer includes a plurality of data lines. The pixel electrode includes a first trunk electrode and a second trunk electrode. Portions of the data line corresponding to the first trunk electrode and the second trunk electrode overlap or partially overlap with the first trunk electrode and the second trunk electrode.