Oblique Pixel Edge Liquid Crystal Display
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Solution Overview
Problem
Vertical alignment liquid crystal displays driven by multiplex driving suffer from non-uniform light leak near pixel edges when viewed from the anti-viewing direction, leading to decreased display quality and increased power consumption due to higher drive frequency requirements.
Innovation Solution
The liquid crystal display features a twisted vertical alignment structure with oblique pixel edges, where the alignment direction of liquid crystal molecules at the center intersects obliquely with the pixel edge, reducing orthogonal portions and improving visibility from the anti-viewing direction by displacing disclination points away from the center.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a vertical alignment liquid crystal display uses a conventional rectangular pixel structure with orthogonal alignment, then the manufacturing process is simple and straightforward, but light leak occurs near pixel edges when viewed from the anti-viewing direction, degrading display quality
Solution Approach 1:
The patent applies asymmetry by changing the pixel edge configuration from a conventional orthogonal rectangular structure to one with oblique edge portions. Specifically, the pixel edge includes first and second oblique line segments that form non-90-degree angles with the alignment direction, creating an asymmetric geometry that prevents the formation of disclination points at pixel edges. This asymmetric design eliminates the light leak phenomenon while maintaining manufacturing feasibility through standard photolithography processes.
2Object-affected harmful factors
If the drive frequency is increased to improve display uniformity, then light leak and display quality improve, but power consumption increases
Solution Approach 1:
The patent applies parameter changes by modifying the geometric parameters of the pixel structure, specifically the angle and orientation of the pixel edge portions relative to the alignment direction. By setting the oblique angles to specific ranges (30-60 degrees relative to the alignment direction), the patent achieves optimal suppression of light leak without requiring increased drive frequency. This parameter optimization allows operation at lower frame rates while maintaining display uniformity, thereby reducing power consumption.
3Ease of manufacture
If the pixel edge is aligned orthogonally with the alignment direction, then the electrode pattern is simple and easy to manufacture, but disclination points form at the pixel edges causing light leak
Solution Approach 1:
The patent applies asymmetry by designing the pixel edge with oblique portions that are not perpendicular to the alignment direction. The first and second oblique line segments are configured at specific angles (30-60 degrees relative to the alignment direction), creating an asymmetric pixel geometry that prevents the formation of disclination points at the edges. This asymmetric configuration eliminates the harmful effect while remaining compatible with standard manufacturing processes.
Solution Approach 2:
The patent applies curvature principles by replacing the sharp orthogonal corners of conventional rectangular pixels with oblique edges that create smoother transitions in the liquid crystal alignment. This curved/oblique configuration reduces the stress concentration at pixel edges that would otherwise lead to disclination formation, while maintaining a geometry that can be easily fabricated using photolithography.
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 configuration enhances display uniformity and quality while allowing for lower frame frequencies, reducing power consumption and minimizing light leaks, thereby improving the overall display performance.
Implementation Method 1
liquid crystal molecules in a liquid crystal layer disposed between two substrates are aligned substantially vertically relative to the surface of the respective substrates
Implementation Method 2
liquid crystal material having negative dielectric constant anisotropy and applying voltage of a threshold voltage or higher between the electrodes of the respective substrates, most of the liquid crystal molecules in the liquid crystal layer will tilt to a horizontal alignment direction
Data Source
AI summary
A liquid crystal display includes: first and second substrates placed opposite each other; first and second electrodes each provided on one face of the first and second electrodes extending in first and second directions intersecting with each other; and a liquid crystal layer provided between the one face of the first substrate and the one face of the second substrate. A pixel is formed in a region where the first and second electrodes intersect, and a pixel edge of the pixel has a line segment which is oblique relative to the first direction. The first and second substrates are respectively subject to alignment treatment, and the liquid crystal layer is a substantial vertical alignment having a twisted structure, and an alignment direction of liquid crystal molecules at a substantial center in a layer thickness direction and the oblique line segment are not orthogonal.