Fringe Field Switching LCD Pixel Electrode Slit Orientation
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Solution Overview
Problem
Fringe field switching (FFS) LCD devices face issues with color shift and reduced transmittance due to disorderly liquid crystal molecule orientation at 'V'-shaped elbow portions, which affects display quality and viewing angle.
Innovation Solution
The FFS-LCD device incorporates pixel electrodes with slits arranged at varied oblique angles relative to gate lines, eliminating elbow portions and allowing for a continuous, fan-shaped electric field orientation, resulting in multiple domains and reduced color shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pixel electrodes with slits at varied oblique angles are used, then viewing angle and color shift are improved, but device complexity increases
Solution Approach 1:
The pixel electrode is segmented into multiple slit regions with different orientations. Each slit group is oriented at a specific angle (e.g., first group at +45°, second group at -45°) to create separate liquid crystal domains. This segmentation allows different viewing angle coverage while maintaining a relatively simple overall electrode structure.
Solution Approach 2:
Different regions of the pixel electrode are given different local properties through varying slit orientations. The first slit group has a specific orientation to address color shift in one direction, while the second slit group has a different orientation to address color shift in another direction. This local differentiation improves overall viewing angle without requiring complete structural redesign.
2Illumination intensity
If transparent common electrode is used, then aperture ratio and transmittance are improved, but liquid crystal molecule orientation control deteriorates
Solution Approach 1:
The common electrode is segmented into multiple electrode groups (first common electrode group, second common electrode group, etc.) corresponding to different slit groups. Each electrode group works with its corresponding slit group to control liquid crystal molecules in specific regions. This segmentation maintains precise orientation control despite using transparent materials, as each segmented electrode-slit pair creates a defined electric field region.
Solution Approach 2:
The slit structure acts as an intermediary element between the transparent common electrode and the liquid crystal molecules. The slits create localized electric field regions that guide liquid crystal molecule orientation, compensating for the lack of orientation control that would otherwise result from using transparent electrode materials.
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 light transmittance and maintains high display quality across a wide viewing angle by preventing disinclination and maintaining stable transmittance across a range of driving voltages.
Implementation Method 1
a fringe electric field is formed between the common electrode 15 and the pixel electrode 18. The liquid crystal molecules disposed over the common electrode 15 and pixel electrodes 18 are driven by this electric field to have a corresponding orientation.
Data Source
AI summary
An exemplary fringe field switching liquid crystal display device (3) includes a first substrate (310) and a second substrate (320) disposed parallel to each other and spaced apart a predetermined distance. A liquid crystal layer (300) is interposed between the first and second substrates. A plurality of gate lines (332) and data lines (331) are formed on the second substrate, thereby defining a plurality of pixel regions. A common electrode (321) is arranged in each pixel region. And a pixel electrode (323) is arranged in each pixel region and insulated from the common electrode, the pixel electrode including a plurality of slits (350) arranged therein. The slits are separate from each other and maintain varied angles including oblique angles relative to the nearest gate lines.