LCD Pixel Electrode Edge Branch Structure for Viewing Angle and Transmittance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal display (LCD) devices with cross-shaped stem electrode patterns face limitations in improving transmittance and side visibility.
Innovation Solution
The proposed LCD device features pixel electrodes with edge electrode portions and branch electrode portions that protrude towards the central portion, along with a specific slit pattern and alignment layers, allowing for the creation of multiple domains with different liquid crystal molecule alignments, enhancing viewing angles and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a cross-shaped stem electrode pattern with fine branch portions is used, then multiple domains can be formed for wide viewing angle, but transmittance and side visibility are limited
Solution Approach 1:
The pixel electrode is divided into multiple independent branch electrode portions that extend from the edge toward the center. These segmented electrodes create distinct domains with different liquid crystal alignment directions, enabling wide viewing angles while maintaining high transmittance through optimized light path management.
Solution Approach 2:
The central stem electrode portion is removed entirely, keeping only the branch electrode portions extending from the edge. This extraction eliminates the blocking effect of the central stem on light transmission while preserving the domain-forming capability through the remaining branch structures.
2Manufacturing precision
If cut portions are formed in field generating electrodes to create multiple domains, then alignment directions of liquid crystal molecules can be controlled, but electrode pattern complexity increases
Solution Approach 1:
The electrode pattern employs asymmetric branch structures extending from the edge at different angles and lengths, creating multiple domains with controlled alignment directions. This asymmetric design achieves precise alignment control without requiring symmetric cut portions or complex central stem structures.
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 improves transmittance and side visibility by optimizing the alignment of liquid crystal molecules, resulting in better luminance and reduced texture, while preventing light leakage defects.
Implementation Method 1
An LCD may apply voltage to a field generating electrode to generate an electric field in a liquid crystal layer and accordingly, determine a direction of alignment of liquid crystals of the liquid crystal layer to control the polarization of incident light
Implementation Method 2
control the polarization of incident light, thereby displaying an image
Implementation Method 3
Liquid crystal molecules are rearranged by fringe field generated between field generating electrode portions facing an edge of the cut portion, whereby a plurality of domains may be defined
Data Source
AI summary
A liquid crystal display device includes an insulating substrate, a data line disposed on the insulating substrate and extended in a first direction, a plurality of pixel electrodes which is disposed on the insulating substrate and in which a slit pattern is defined, a common electrode facing the pixel electrodes, and a liquid crystal layer interposed between the pixel electrodes and the common electrode, where each of the pixel electrodes includes an edge electrode portion and a plurality of branch electrode portions protruding in a direction toward a central portion of the pixel electrode from the edge electrode portion, and at least a portion of the edge electrode portion overlaps the data line.