Thin Film Transistor Array Substrate With Segmented Electrodes
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Solution Overview
Problem
Conventional liquid crystal display technologies face issues with reduced image contrast and weak electric fields at wide viewing angles, leading to poor display quality and low light transmittance in both IPS and FFS panels.
Innovation Solution
A thin film transistor array substrate design featuring a transparent substrate with a data line and multiple transparent electrodes, where the first sub-electrode is narrower than the main electrode and the second sub-electrode is wider than the data line, forming a stronger horizontal electric field to improve light transmittance and viewing angle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the distance between pixel electrode and common electrode is increased to form stronger horizontal electric field, then the electric field strength is improved, but the required driving voltage becomes too high for the driving chip to supply
Solution Approach 1:
The common electrode is segmented into two separate common electrodes positioned at different locations. This segmentation allows the electric field to be strengthened through optimized electrode geometry and positioning without requiring increased driving voltage, as each segmented electrode contributes to the overall field strength independently
Solution Approach 2:
The patent applies different electrode width dimensions at different locations: the first common electrode has a first width while the second common electrode has a second width. This local quality variation optimizes the electric field distribution in different regions, strengthening the field where needed while maintaining manageable voltage requirements
2Illumination intensity
If transparent ITO electrode is used in FFS technology to reduce electrode width and distance, then light transmittance is improved, but the electrode still absorbs 5% of transmitting light leading to reduction in panel light transmittance
Solution Approach 1:
Multiple transparent electrode layers are merged into a unified electrode structure. By combining several thin transparent electrode layers, the patent achieves the necessary electrical conductivity and field strength while maintaining high light transmittance, as the cumulative absorption of multiple thin layers is less than a single thick layer
Solution Approach 2:
The patent employs composite electrode structures combining transparent conductive materials with optimized geometric configurations. This composite approach allows the electrode to function effectively electrically while minimizing optical absorption, achieving both strong electric field generation and high light transmittance
3Force
If pixel electrode and common electrode are positioned closer together in FFS panel, then fringe electric field is strengthened for wide viewing angle, but the electrode structure becomes more complex
Solution Approach 1:
The common electrode is divided into two separate electrodes positioned at different locations and orientations. This segmentation creates multiple fringe field regions that work together to strengthen the overall electric field effect, achieving wide viewing angle performance while the modular structure manages complexity through systematic arrangement
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 solution enhances light transmittance and maintains high image quality across various viewing angles by creating a stable and intense horizontal electric field, addressing weaknesses in both IPS and FFS technologies.
Implementation Method 1
a horizontal electric field driving the liquid crystal is formed between a pixel electrode 1 and a common electrode 2
Implementation Method 2
The liquid crystal molecules both between the electrodes and directly above the electrodes may oriented to rotate in the plane direction
Data Source
AI summary
A thin film transistor array substrate, a method for manufacturing the same, and a liquid crystal display device having the thin-film transistor array substrate are disclosed. The thin film transistor array substrate includes a data line formed on a transparent substrate, a first transparent electrode located in a same layer as the data line, an insulating layer covering the data line and the first transparent electrode, and a second transparent electrode located on the insulating layer. The second transparent electrode includes a first transparent sub-electrode and a second transparent sub-electrode, and the width of the first transparent sub-electrode is less than the width of the first transparent electrode, and the width of the second transparent sub-electrode is greater than the width of the data line.