Fringe Field Switch Liquid Crystal Display Auxiliary Electrode
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Solution Overview
Problem
In traditional fringe field switching (FFS) liquid crystal displays, complex electric fields at the boundary of pixel elements lead to unstable liquid crystal molecule arrangements, causing disclination lines and non-uniform picture display due to unwanted electric fields between the end electrode and the common electrode.
Innovation Solution
The introduction of an auxiliary electrode on the upper substrate, parallel to the end electrode and with a preset distance, effectively attenuates unwanted electric fields, stabilizing liquid crystal molecule arrangements and reducing disclination lines by ensuring consistent deflection directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional electrode structure is used in FFS liquid crystal display, then the device complexity is low, but the picture display uniformity deteriorates due to complex electric fields at pixel boundary causing disclination lines
Solution Approach 1:
The pixel electrode is segmented into multiple branch electrodes that are insulated from each other, with the end electrode separated from the common electrode by a first insulating layer. This segmentation breaks the continuous electrode structure into discrete segments, allowing independent control of electric fields in different regions and eliminating the complex electric field interactions at the pixel boundary that cause disclination lines.
Solution Approach 2:
A first insulating layer is introduced as an intermediary between the end electrode and the common electrode. This insulating layer mediates the electric field interaction by preventing direct contact and field line distortion between the two electrodes, thereby stabilizing the liquid crystal molecule arrangement at the pixel boundary and improving picture display uniformity.
2Area of stationary object
If end electrode is located at pixel boundary, then the aperture ratio is increased, but the liquid crystal molecule arrangement stability deteriorates due to complex electric fields
Solution Approach 1:
The end electrode is segmented and insulated from the common electrode by the first insulating layer, allowing the electrode structure to extend to the pixel boundary while maintaining stable electric field distribution. This segmentation enables the aperture ratio to be maximized without compromising liquid crystal molecule arrangement stability.
Solution Approach 2:
The first insulating layer creates an equipotential region between the end electrode and common electrode, ensuring that the electric field potential remains stable at the pixel boundary. This equipotential condition prevents electric field distortion that would otherwise cause liquid crystal molecule arrangement instability, allowing the end electrode to be positioned at the pixel boundary for maximum aperture ratio.
3Stability of the object's composition
If insulating layer is introduced between end electrode and common electrode, then the liquid crystal molecule arrangement stability is improved, but the device complexity increases
Solution Approach 1:
The first insulating layer serves as a simple intermediary component between the end electrode and common electrode. By introducing this single insulating layer, the complex electric field interaction is eliminated, stabilizing liquid crystal molecule arrangement without requiring complex multi-layer or multi-component structures.
Solution Approach 2:
The first insulating layer is applied locally only at the region where the end electrode meets the common electrode, rather than throughout the entire device. This localized application provides the necessary electric field stabilization precisely where needed at the pixel boundary, improving liquid crystal molecule arrangement stability without adding unnecessary complexity to other regions of the device.
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 solution improves the uniformity of picture display, reduces the width of the black matrix, and increases the aperture ratio, leading to higher quality and more stable liquid crystal display performance.
Implementation Method 1
Ex is an electric field parallel to an end electrode 61, Ey is an electric field parallel to branch electrodes 62, and Ez is an electric field perpendicular to the plane of the Ex and the Ey
Implementation Method 2
when the applied voltage is increased till the applied electric field enables the liquid crystal molecules to averagely deflect 45°, the transmittance T is the maximum
Data Source
AI summary
The present invention discloses a fringe field switching (FFS) liquid crystal display and a color filter substrate. The liquid crystal display includes an upper substrate, a lower substrate, and a liquid crystal layer sandwiched between the upper substrate and the lower substrate. The lower substrate includes a common electrode and a pixel electrode, and the pixel electrode includes at least one branch electrode and an end electrode for connecting the branch electrode; and an auxiliary electrode corresponding to the end electrode is arranged on the upper substrate. In the presence of the auxiliary electrode, unwanted electric fields between the end electrode and the common electrode are effectively attenuated, and arrangement of liquid crystal molecules at the boundary of a pixel element where the end electrode is located is stabilized, so that disclination lines are improved, pictures are displayed uniformly with high quality.