Overlapping Pixel Electrode Design for LCD Viewing Angle
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Solution Overview
Problem
Vertically aligned mode liquid crystal display (LCD) devices face deterioration in display quality due to irregular texture caused by fine slits or protrusions on field-generating electrodes, which affect the tilt direction of liquid crystal molecules and viewing angles.
Innovation Solution
The design includes a pixel electrode with first and second sub-pixel electrodes, each having a horizontal stem and branches, overlapping with data lines, and connected to thin-film transistors, allowing for controlled voltage application to liquid crystal capacitors to stabilize liquid crystal molecule orientation and reduce texture irregularities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If incisions such as fine slits are formed on field-generating electrodes to widen viewing angles, then the tilt direction of liquid crystal molecules is diversified, but irregular texture appears in areas not affected by the incisions, deteriorating display quality
Solution Approach 1:
The pixel electrode is divided into multiple sub-pixel electrodes (first sub-pixel electrode and second sub-pixel electrode), each with independent incisions. This segmentation allows different regions to have different tilt directions, diversifying the overall tilt directions of liquid crystal molecules to widen viewing angles while preventing irregular texture in non-affected areas through controlled incision placement in each sub-region
Solution Approach 2:
Different sub-pixel electrodes are provided with incisions at different locations and orientations, creating local variations in tilt direction control. The first sub-pixel electrode has incisions at specific positions while the second sub-pixel electrode has incisions at different positions, ensuring that each local region contributes to diversified tilt directions without causing irregular texture artifacts
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 display quality by preventing irregular texture and improving lateral visibility by diversifying the tilt direction of liquid crystal molecules, thereby widening the viewing angle and maintaining image consistency from different angles.
Implementation Method 1
The LCD device generates an electric field in the liquid crystal layer by applying a voltage to the field-generating electrodes
Implementation Method 2
The LCD device determines the orientation of liquid crystal molecules in the liquid crystal layer, and controls the polarization of incident light
Implementation Method 3
The incisions or the protrusions determine the tilt direction of liquid crystal molecules
Data Source
AI summary
A liquid crystal display device includes a first substrate, a gate line disposed on the first substrate, a data line disposed on the first substrate and intersecting the gate line, and a pixel electrode disposed in a pixel region at least partially defined by the gate line and the data line, and overlapping the data line, the pixel electrode including first and second sub-pixel electrodes separated from each other. Each of the first and second sub-pixel electrodes includes a horizontal stem extending in a direction intersecting the data line, and branches connected to the horizontal stem.