V-Shaped Branch Pixel Electrode for LCD Transmittance
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Solution Overview
Problem
Conventional FFS LCD panels experience issues with disclination lines or nodes due to liquid crystal molecules being tilted in different directions above pixel electrodes and alignment slits, leading to reduced transmittance.
Innovation Solution
A pixel structure with a first electrode layer featuring enclosed-frame-shaped portions and V-shaped branch portions, along with a second electrode layer, ensures that liquid crystal molecules above both are tilted in the same direction, preventing disclination lines or nodes and maintaining high transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional FFS LCD panel structure is used, then wide viewing angle is achieved, but disclination lines or nodes occur due to liquid crystal molecules tilting in different directions, reducing transmittance
Solution Approach 1:
The pixel electrode is designed with asymmetric V-shaped branch portions that create a specific electric field distribution pattern. This asymmetric structure ensures that the electric field lines are directed uniformly, causing liquid crystal molecules to tilt in the same direction across the entire pixel area, thereby preventing disclination lines or nodes while maintaining wide viewing angle characteristics
Solution Approach 2:
The invention introduces a vertical component to the electric field by designing the V-shaped branch portions with specific orientations. This creates a three-dimensional electric field distribution that controls liquid crystal molecule tilting in a unified direction, resolving the conflict between wide viewing angle (horizontal performance) and transmittance (vertical optical performance)
2Adaptability or versatility
If liquid crystal molecules are tilted in different directions above pixel electrodes and alignment slits, then wide viewing angle is achieved, but disclination lines or nodes are generated
Solution Approach 1:
The V-shaped branch portions are designed with asymmetric geometry where the opening angles and orientations are specifically configured. This asymmetry creates a dominant electric field direction that overrides the natural tendency for multi-directional tilting, eliminating disclination defects while preserving the wide viewing angle effect through controlled molecular orientation
Solution Approach 2:
The invention modifies the electric field parameters by changing the electrode geometry to V-shaped branches with specific opening angles and aspect ratios. This parameter change alters the electric field distribution from a conventional pattern to one that produces uniform molecular tilting, preventing disclination formation while maintaining the optical performance needed for wide viewing angle
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 proposed pixel structure enhances transmittance and display quality by aligning liquid crystal molecules uniformly, improving the viewing angle and reducing color shift in LCD panels.
Implementation Method 1
electric field sensed by liquid crystal molecules above pixel electrodes is different from electric field sensed by liquid crystal molecules above alignment slits
Data Source
AI summary
A pixel structure includes a scan line, a data line, an active device, a first electrode layer, a second electrode layer, and an insulation layer. The active device is electrically connected to the scan line and the data line. The first electrode layer is electrically connected to the active device. The second electrode layer is electrically insulated from the first electrode layer. The insulation layer is located between the first electrode layer and the second electrode layer, and the first electrode layer or the second electrode layer includes an enclosed-frame-shaped portion, first V-shaped branch portions, and second V-shaped branch portions. The first V-shaped branch portions and the second V-shaped branch portions are arranged within the enclosed-frame-shaped portion in opposite directions, and end terminals of the first V-shaped branch portions and end terminals of the second V-shaped branch portions are connected to the enclosed-frame-shaped portion.