VA LCD Domain Regulators for Viewing Angle and Aperture Ratio
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Solution Overview
Problem
Vertically-aligned (VA) LCDs suffer from a narrow viewing angle, which limits their application, despite offering higher contrast and response speed compared to twisted nematic (TN) LCDs, and improving viewing angle performance through multi-domain configurations increases darkened regions and reduces aperture ratio.
Innovation Solution
The use of domain regulators in adjacent pixels to align liquid crystal molecules obliquely in specific directions, reducing the number of oblique directions in a single pixel and increasing the aperture ratio while maintaining improved viewing angle performance by varying orientations between pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the orientation of liquid crystal molecules is divided into multiple directions within each pixel to improve viewing angle performance, then viewing angle performance is improved, but the total area of darkened regions increases and aperture ratio decreases
Solution Approach 1:
The patent divides the pixel structure into multiple domains using domain regulators (protrusions and slits), creating distinct regions with different liquid crystal orientations. This segmentation allows multiple viewing directions to be accommodated while controlling the spatial distribution of darkened regions, thereby improving viewing angle performance while managing aperture ratio trade-offs.
Solution Approach 2:
The patent applies different orientation characteristics to different local regions within pixels through domain regulators. Each domain has locally optimized liquid crystal alignment (different tilt directions), allowing the display to achieve good viewing angle performance in multiple directions while the overall aperture ratio is maintained by strategic placement of these local domains.
2Adaptability or versatility
If more slits and protrusions are provided in each pixel to increase the number of liquid crystal orientations, then viewing angle performance is improved, but the area of darkened regions increases significantly
Solution Approach 1:
The patent implements a balanced approach by providing domain regulators in adjacent pixels rather than densely packing them within each pixel. This partial action strategy achieves sufficient multi-directional orientation control for improved viewing angle performance while avoiding excessive darkened region area that would result from more aggressive domain multiplication within single pixels.
Solution Approach 2:
The patent combines the domain regulator functions across adjacent pixels, where protrusions and slits in neighboring pixels work together to provide complementary orientation directions. This merging approach distributes the orientation control function across a larger area, reducing the relative area of darkened regions while maintaining comprehensive viewing angle coverage.
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
This approach enhances viewing angle performance and maintains a high aperture ratio by reducing darkened regions and minimizing color-mixing issues, providing a balanced solution for VA LCDs.
Implementation Method 1
a liquid crystal layer having a negative dielectric anisotropy sandwiched between two substrates treated by vertical alignment
Implementation Method 2
When a predetermined voltage is applied, the liquid crystal molecules are aligned in a horizontal direction
Implementation Method 3
When a voltage is applied, electric fields oblique to the surfaces of the substrates are produced near the slits 130 and the edges 120a of the electrodes
Data Source
AI summary
Disclosed is a liquid crystal display mainly including a liquid crystal layer having negative dielectric anisotropy sandwiched between two substrates treated by vertical alignment process, and first and second domain regulators for regulating orientation of the liquid crystal layer such that the liquid crystal molecules are aligned obliquely when a voltage is applied, so that the orientation will include a plurality of first and second directions. The first directions are different from the second directions. Each pixel is provided with one of the first and second domain regulators in a manner that every two adjacent pixels or every two adjacent R pixels, two adjacent G pixels or two adjacent B pixels are provided with different domain regulators.