Zigzag Pixel Electrode Branches for LCD Side Visibility
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Solution Overview
Problem
Liquid crystal display (LCD) devices in super vertical alignment (SVA) and patterned vertical alignment (PVA) modes face challenges in uniform control of liquid crystal molecules, leading to suboptimal side visibility and aperture ratio due to the presence of slit portions on electrodes.
Innovation Solution
An array substrate design with a lower substrate divided into unit pixel areas, featuring a pixel electrode with branch portions extending in zigzag shapes and support electrodes, which improves the alignment of liquid crystal molecules and enhances side visibility by varying the electric field direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If slit portions are formed on the electric field generating electrode to improve viewing angle in PVA mode, then side visibility is improved, but aperture ratio is reduced
Solution Approach 1:
The pixel electrode is divided into multiple branch portions that extend in different directions (e.g., first branch portions in a first direction, second branch portions in a second direction). This segmentation creates multiple electric field directions without requiring physical slits, thereby improving side visibility while maintaining aperture ratio.
Solution Approach 2:
Instead of using slits (one-dimensional openings) to control liquid crystal alignment, the patent uses branch portions extending in multiple directions (adding dimensional complexity to the electrode structure). This approach controls liquid crystal orientation through multi-directional electric fields without reducing the effective pixel area.
2Area of stationary object
If micro-slits are formed only on the lower electrode in SVA mode to reduce the number of slit portions, then aperture ratio is improved, but uniform control of liquid crystal molecules is compromised
Solution Approach 1:
The pixel electrode employs asymmetric branch structures with different orientations (first branch portions in a first direction, second branch portions in a second direction) to create balanced multi-directional control. This asymmetric design compensates for the lack of slits on the upper electrode, achieving uniform liquid crystal control without sacrificing aperture ratio.
Solution Approach 2:
The branch portions serve multiple functions: they define domain boundaries, control liquid crystal alignment in multiple directions, and maintain aperture ratio. This multi-functionality replaces the need for separate slit structures, achieving both aperture ratio improvement and uniform liquid crystal control.
3Ease of operation
If branch portions are added to the pixel electrode to improve side visibility through multi-directional electric fields, then side visibility is improved, but device complexity increases
Solution Approach 1:
Multiple branch portions (first and second branch portions extending in different directions) are merged into a single integrated pixel electrode structure. This combining approach achieves multi-directional liquid crystal control without requiring separate electrode layers or additional components, thereby limiting the increase in device complexity.
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 enhances side visibility and display quality by reducing the third efficiency of liquid crystal molecules in low gray scales and maintaining visibility across medium gray scales, thereby improving the overall display performance.
Implementation Method 1
When a voltage is applied to the electric field generating electrodes, the electric field generating electrodes generate an electric field in the liquid crystal layer. The electric field determines the alignment of liquid crystal molecules of the liquid crystal layer
Data Source
AI summary
An array substrate includes a lower substrate, a switching element and a pixel electrode. In the lower substrate, unit pixel areas are each divided into a plurality of domains. The switching element is disposed on the lower substrate and transmits a pixel signal. The pixel electrode is disposed on the unit pixel area and is electrically connected to the switching element. The pixel electrode includes a plurality of branch portions disposed thereon. A portion of the branch portions is longitudinally extended in a zigzag shape along different directions in correspondence with the domains.