Fringe-Field-Switching LCD Conductive Reflection Structure
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Solution Overview
Problem
Conventional fringe-field-switching (FFS)-mode liquid crystal displays (LCDs) face issues with light leakage and color mixing due to incomplete rubbing at stepped portions of data lines, leading to reduced outdoor visibility and increased failure rates, despite improvements in aperture ratio and transmittance.
Innovation Solution
A new FFS-mode LCD design featuring a transparent common electrode and conductive reflection structure with slits, electrically connected to the drain electrode, and a transparent pixel electrode with interlayer insulating layers, optimized to maximize reflection regions and minimize light shielding, thereby enhancing aperture ratio and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If light shielding layers are removed to improve aperture ratio, then aperture ratio and transmittance increase, but light leakage and color mixing occur due to incomplete rubbing at stepped portions
Solution Approach 1:
The patent applies different surface treatments to different regions: the data line has a first rubbing treatment while the pixel electrode has a second rubbing treatment with a different rubbing direction. This local differentiation ensures proper LC alignment at the stepped portion without requiring light shielding layers, thus maintaining high aperture ratio while preventing light leakage.
2Use of energy by stationary object
If light shielding layers are removed to reduce power consumption, then power consumption decreases, but outdoor visibility deteriorates due to increased light leakage
Solution Approach 1:
By applying different rubbing treatments to different regions (first rubbing treatment on data line, second rubbing treatment on pixel electrode with different direction), the patent eliminates light leakage without needing light shielding layers. This maintains low power consumption while improving outdoor visibility through reduced light leakage.
3Ease of manufacture
If data line structure is simplified to improve manufacturing, then manufacturing ease increases, but rubbing completeness deteriorates at stepped portions
Solution Approach 1:
The patent maintains a simple data line structure without light shielding layers but achieves complete rubbing by applying different rubbing treatments to different regions. The first rubbing treatment on the data line and second rubbing treatment on the pixel electrode with different directions ensure proper LC alignment throughout, achieving both manufacturing simplicity and rubbing completeness.
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 significantly reduces light leakage and color mixing, improving screen quality and outdoor visibility while maintaining high aperture ratios and low power consumption.
Implementation Method 1
a liquid crystal (LC) layer interposed between the lower and upper substrates
Implementation Method 2
a conductive reflection structure connected to the transparent common electrode and disposed over the data line and the gate line
Data Source
AI summary
Provided are a fringe-field-switching (FFS)-mode liquid crystal display (LCD) and a method of manufacturing the same. The FFS-mode LCD includes a transparent common electrode, a conductive reflection structure electrically connected to the transparent common electrode, and a transparent pixel electrode formed on the conductive reflection structure and including a plurality of slits. The transparent common electrode is formed on a region including a data line and a gate line so that respective unit pixel regions can be electrically connected to one another.