Cruciform Pixel Electrode LCD Design for Viewing Angle
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Solution Overview
Problem
In liquid crystal displays (LCDs) with multiple domains, the fringe field from cutouts in pixel electrodes can cause irregular motion of liquid crystal molecules, leading to deteriorated display quality and strain in curved LCDs due to misalignment between upper and lower plates, which affects transmittance and viewing angle.
Innovation Solution
The design includes a first pixel electrode with a cruciform stem electrode and a second pixel electrode with a plate-like part and branch electrodes extending in four directions, along with a common electrode, where the first pixel electrode is applied with a higher voltage than the second, reducing the fringe field's influence and maintaining display quality while increasing transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cutouts are formed in the pixel electrode to create multiple domains, then viewing angle is improved, but display quality deteriorates due to irregular liquid crystal motion caused by fringe field
Solution Approach 1:
The pixel electrode is divided into multiple domains by forming cutouts (slits) that extend from edges toward the center. These cutouts segment the electrode into distinct regions, each generating liquid crystal molecules in specific alignment directions. This segmentation enables wide viewing angle coverage while the controlled geometry of cutouts prevents excessive fringe field effects
Solution Approach 2:
Different regions of the pixel electrode are designed with different properties: the cutout regions have specific widths and positions optimized for domain formation, while the plate-like part maintains a uniform structure to minimize fringe field. The bridge electrode connects these regions with controlled characteristics, creating local variations that optimize overall performance
2Loss of energy
If a plate-like pixel electrode without cutouts is used to increase transmittance, then transmittance is improved, but display quality deteriorates due to reduced fringe field influence causing irregular liquid crystal motion
Solution Approach 1:
The pixel electrode is divided into multiple domains by forming cutouts (slits) that extend from edges toward the center. These cutouts segment the electrode into distinct regions, each generating liquid crystal molecules in specific alignment directions. This segmentation enables wide viewing angle coverage while the controlled geometry of cutouts prevents excessive fringe field effects
Solution Approach 2:
Different regions of the pixel electrode are designed with different properties: the cutout regions have specific widths and positions optimized for domain formation, while the plate-like part maintains a uniform structure to minimize fringe field. The bridge electrode connects these regions with controlled characteristics, creating local variations that optimize overall performance
3Adaptability or versatility
If multiple domains are formed with cutouts, then viewing angle is improved, but strain occurs in curved LCDs due to misalignment between upper and lower plates
Solution Approach 1:
The cutouts are designed with asymmetric positioning and dimensions relative to the pixel electrode structure. This asymmetric design creates specific fringe field patterns that generate liquid crystal domains with controlled orientation. The asymmetry helps align the liquid crystal molecules in a manner that reduces strain when the display is curved, while still maintaining wide viewing angle performance
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 prevents display quality deterioration while enhancing transmittance in LCDs with multiple domains, maintaining a high contrast ratio and wide viewing angle by minimizing the fringe field's impact on the plate-like part of the pixel electrode.
Implementation Method 1
the field generating electrode is applied with a voltage to generate an electric field in the liquid crystal layer and an orientation of liquid crystal molecules of the liquid crystal layer is determined and polarization of incident light is controlled based on the generated electric field
Implementation Method 2
This method may form the plurality of domains by realigning the liquid crystal by a fringe field formed between an edge of the cutout and the field generating electrode facing the edge
Data Source
AI summary
A liquid crystal display includes a first substrate, a first pixel electrode disposed on the first substrate, a second pixel electrode overlapping the first pixel electrode, having an insulating layer disposed therebetween, wherein the second pixel electrode includes a plate-like part having an integrated shape, a plurality of branch electrodes extending from the plate-like part, and a cruciform cutout including a horizontal part and a vertical part intersecting each other at a center of the plate-like part, and the first pixel electrode includes a cruciform stem electrode having a horizontal stem and a vertical stem intersecting each other at the center.